diff --git a/packages/google-apps-card/google/apps/card/gapic_version.py b/packages/google-apps-card/google/apps/card/gapic_version.py
index 3b0a9d9a8d43..558c8aab67c5 100644
--- a/packages/google-apps-card/google/apps/card/gapic_version.py
+++ b/packages/google-apps-card/google/apps/card/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.1.2"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-apps-card/google/apps/card_v1/gapic_version.py b/packages/google-apps-card/google/apps/card_v1/gapic_version.py
index 3b0a9d9a8d43..558c8aab67c5 100644
--- a/packages/google-apps-card/google/apps/card_v1/gapic_version.py
+++ b/packages/google-apps-card/google/apps/card_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.1.2"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-apps-card/noxfile.py b/packages/google-apps-card/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-apps-card/noxfile.py
+++ b/packages/google-apps-card/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-apps-card/setup.py b/packages/google-apps-card/setup.py
index 1abffeb9aab3..1987618bea1f 100644
--- a/packages/google-apps-card/setup.py
+++ b/packages/google-apps-card/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-apps-card"
 
diff --git a/packages/google-apps-card/testing/constraints-3.7.txt b/packages/google-apps-card/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-apps-card/testing/constraints-3.7.txt
+++ b/packages/google-apps-card/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-apps-script-type/noxfile.py b/packages/google-apps-script-type/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-apps-script-type/noxfile.py
+++ b/packages/google-apps-script-type/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-apps-script-type/setup.py b/packages/google-apps-script-type/setup.py
index f497d1175013..0cb5ea058f79 100644
--- a/packages/google-apps-script-type/setup.py
+++ b/packages/google-apps-script-type/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-apps-script-type"
 
diff --git a/packages/google-apps-script-type/testing/constraints-3.7.txt b/packages/google-apps-script-type/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-apps-script-type/testing/constraints-3.7.txt
+++ b/packages/google-apps-script-type/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-alloydb-connectors/README.rst b/packages/google-cloud-alloydb-connectors/README.rst
index 6c78471e2016..fe12c1d67942 100644
--- a/packages/google-cloud-alloydb-connectors/README.rst
+++ b/packages/google-cloud-alloydb-connectors/README.rst
@@ -15,7 +15,7 @@ Python Client for AlloyDB connectors
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-alloydb-connectors.svg
    :target: https://pypi.org/project/google-cloud-alloydb-connectors/
 .. _AlloyDB connectors: https://cloud.google.com/alloydb/docs
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/connectors/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/connectors/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/alloydb/docs
 
 Quick Start
diff --git a/packages/google-cloud-alloydb-connectors/docs/index.rst b/packages/google-cloud-alloydb-connectors/docs/index.rst
index 5303f97755cf..7dd37a46a9f1 100644
--- a/packages/google-cloud-alloydb-connectors/docs/index.rst
+++ b/packages/google-cloud-alloydb-connectors/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-alloydb-connectors`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-alloydb-connectors/docs/summary_overview.md b/packages/google-cloud-alloydb-connectors/docs/summary_overview.md
new file mode 100644
index 000000000000..6c4af57e8a02
--- /dev/null
+++ b/packages/google-cloud-alloydb-connectors/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# AlloyDB connectors API
+
+Overview of the APIs available for AlloyDB connectors API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+AlloyDB connectors API.
+
+[classes](https://cloud.google.com/python/docs/reference/connectors/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/connectors/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/connectors/latest/summary_property.html)
diff --git a/packages/google-cloud-alloydb-connectors/noxfile.py b/packages/google-cloud-alloydb-connectors/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-alloydb-connectors/noxfile.py
+++ b/packages/google-cloud-alloydb-connectors/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-alloydb-connectors/setup.py b/packages/google-cloud-alloydb-connectors/setup.py
index 37af89a03ccc..b0acdf41e030 100644
--- a/packages/google-cloud-alloydb-connectors/setup.py
+++ b/packages/google-cloud-alloydb-connectors/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-alloydb-connectors"
 
diff --git a/packages/google-cloud-alloydb-connectors/testing/constraints-3.7.txt b/packages/google-cloud-alloydb-connectors/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-alloydb-connectors/testing/constraints-3.7.txt
+++ b/packages/google-cloud-alloydb-connectors/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-alloydb/README.rst b/packages/google-cloud-alloydb/README.rst
index dbc6e53e435e..258140122157 100644
--- a/packages/google-cloud-alloydb/README.rst
+++ b/packages/google-cloud-alloydb/README.rst
@@ -15,7 +15,7 @@ Python Client for AlloyDB
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-alloydb.svg
    :target: https://pypi.org/project/google-cloud-alloydb/
 .. _AlloyDB: https://cloud.google.com/alloydb/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/alloydb/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/alloydb/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/alloydb/
 
 Quick Start
diff --git a/packages/google-cloud-alloydb/docs/index.rst b/packages/google-cloud-alloydb/docs/index.rst
index 66f1d356a64d..281d9a8e9a24 100644
--- a/packages/google-cloud-alloydb/docs/index.rst
+++ b/packages/google-cloud-alloydb/docs/index.rst
@@ -40,3 +40,8 @@ For a list of all ``google-cloud-alloydb`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-alloydb/docs/summary_overview.md b/packages/google-cloud-alloydb/docs/summary_overview.md
new file mode 100644
index 000000000000..4d6bcab5b2d9
--- /dev/null
+++ b/packages/google-cloud-alloydb/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# AlloyDB API
+
+Overview of the APIs available for AlloyDB API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+AlloyDB API.
+
+[classes](https://cloud.google.com/python/docs/reference/alloydb/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/alloydb/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/alloydb/latest/summary_property.html)
diff --git a/packages/google-cloud-alloydb/noxfile.py b/packages/google-cloud-alloydb/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-alloydb/noxfile.py
+++ b/packages/google-cloud-alloydb/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-appengine-logging/README.rst b/packages/google-cloud-appengine-logging/README.rst
index afd27f107d4d..7be5f375b895 100644
--- a/packages/google-cloud-appengine-logging/README.rst
+++ b/packages/google-cloud-appengine-logging/README.rst
@@ -15,7 +15,7 @@ Python Client for App Engine Logging Protos
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-appengine-logging.svg
    :target: https://pypi.org/project/google-cloud-appengine-logging/
 .. _App Engine Logging Protos: https://cloud.google.com/logging/docs/reference/v2/rpc/google.appengine.logging.v1
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/appenginelogging/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/appenginelogging/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/logging/docs/reference/v2/rpc/google.appengine.logging.v1
 
 Quick Start
diff --git a/packages/google-cloud-appengine-logging/docs/index.rst b/packages/google-cloud-appengine-logging/docs/index.rst
index c4e420e42308..348e526ec97b 100644
--- a/packages/google-cloud-appengine-logging/docs/index.rst
+++ b/packages/google-cloud-appengine-logging/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-appengine-logging`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-appengine-logging/docs/summary_overview.md b/packages/google-cloud-appengine-logging/docs/summary_overview.md
new file mode 100644
index 000000000000..07a34dd93c3c
--- /dev/null
+++ b/packages/google-cloud-appengine-logging/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# App Engine Logging Protos API
+
+Overview of the APIs available for App Engine Logging Protos API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+App Engine Logging Protos API.
+
+[classes](https://cloud.google.com/python/docs/reference/appenginelogging/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/appenginelogging/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/appenginelogging/latest/summary_property.html)
diff --git a/packages/google-cloud-appengine-logging/noxfile.py b/packages/google-cloud-appengine-logging/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-appengine-logging/noxfile.py
+++ b/packages/google-cloud-appengine-logging/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-appengine-logging/setup.py b/packages/google-cloud-appengine-logging/setup.py
index 19f249495b81..d3c043efe2bd 100644
--- a/packages/google-cloud-appengine-logging/setup.py
+++ b/packages/google-cloud-appengine-logging/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-appengine-logging"
 
diff --git a/packages/google-cloud-appengine-logging/testing/constraints-3.7.txt b/packages/google-cloud-appengine-logging/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-appengine-logging/testing/constraints-3.7.txt
+++ b/packages/google-cloud-appengine-logging/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-bigquery-logging/README.rst b/packages/google-cloud-bigquery-logging/README.rst
index efa9f0d1030c..784096be6d95 100644
--- a/packages/google-cloud-bigquery-logging/README.rst
+++ b/packages/google-cloud-bigquery-logging/README.rst
@@ -15,7 +15,7 @@ Python Client for BigQuery Logging Protos
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-bigquery-logging.svg
    :target: https://pypi.org/project/google-cloud-bigquery-logging/
 .. _BigQuery Logging Protos: https://cloud.google.com/bigquery/docs/reference/auditlogs
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/bigquerylogging/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/bigquerylogging/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/bigquery/docs/reference/auditlogs
 
 Quick Start
diff --git a/packages/google-cloud-bigquery-logging/docs/index.rst b/packages/google-cloud-bigquery-logging/docs/index.rst
index 7f3156705f57..cbdb2a268d00 100644
--- a/packages/google-cloud-bigquery-logging/docs/index.rst
+++ b/packages/google-cloud-bigquery-logging/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-bigquery-logging`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-bigquery-logging/docs/summary_overview.md b/packages/google-cloud-bigquery-logging/docs/summary_overview.md
new file mode 100644
index 000000000000..99bc3d51f479
--- /dev/null
+++ b/packages/google-cloud-bigquery-logging/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# BigQuery Logging Protos API
+
+Overview of the APIs available for BigQuery Logging Protos API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+BigQuery Logging Protos API.
+
+[classes](https://cloud.google.com/python/docs/reference/bigquerylogging/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/bigquerylogging/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/bigquerylogging/latest/summary_property.html)
diff --git a/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging/gapic_version.py b/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging/gapic_version.py
index a8679199c444..558c8aab67c5 100644
--- a/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging/gapic_version.py
+++ b/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.4.3"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging_v1/gapic_version.py b/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging_v1/gapic_version.py
index a8679199c444..558c8aab67c5 100644
--- a/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging_v1/gapic_version.py
+++ b/packages/google-cloud-bigquery-logging/google/cloud/bigquery_logging_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.4.3"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-cloud-bigquery-logging/noxfile.py b/packages/google-cloud-bigquery-logging/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-bigquery-logging/noxfile.py
+++ b/packages/google-cloud-bigquery-logging/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-bigquery-logging/setup.py b/packages/google-cloud-bigquery-logging/setup.py
index ef43b37b9df7..405da8620a3a 100644
--- a/packages/google-cloud-bigquery-logging/setup.py
+++ b/packages/google-cloud-bigquery-logging/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-bigquery-logging"
diff --git a/packages/google-cloud-bigquery-logging/testing/constraints-3.7.txt b/packages/google-cloud-bigquery-logging/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-bigquery-logging/testing/constraints-3.7.txt
+++ b/packages/google-cloud-bigquery-logging/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-common/README.rst b/packages/google-cloud-common/README.rst
index 6818ab33c204..aa186a471438 100644
--- a/packages/google-cloud-common/README.rst
+++ b/packages/google-cloud-common/README.rst
@@ -15,7 +15,7 @@ Python Client for Google Cloud Common
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-common.svg
    :target: https://pypi.org/project/google-cloud-common/
 .. _Google Cloud Common: https://cloud.google.com
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/common/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/common/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com
 
 Quick Start
diff --git a/packages/google-cloud-common/docs/summary_overview.md b/packages/google-cloud-common/docs/summary_overview.md
new file mode 100644
index 000000000000..7235923b1976
--- /dev/null
+++ b/packages/google-cloud-common/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Google Cloud Common API
+
+Overview of the APIs available for Google Cloud Common API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Google Cloud Common API.
+
+[classes](https://cloud.google.com/python/docs/reference/common/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/common/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/common/latest/summary_property.html)
diff --git a/packages/google-cloud-common/google/cloud/common/gapic_version.py b/packages/google-cloud-common/google/cloud/common/gapic_version.py
index 867d14fbabc7..558c8aab67c5 100644
--- a/packages/google-cloud-common/google/cloud/common/gapic_version.py
+++ b/packages/google-cloud-common/google/cloud/common/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.3.3"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-cloud-common/noxfile.py b/packages/google-cloud-common/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-common/noxfile.py
+++ b/packages/google-cloud-common/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-common/setup.py b/packages/google-cloud-common/setup.py
index 098b2623246b..4e7805f29230 100644
--- a/packages/google-cloud-common/setup.py
+++ b/packages/google-cloud-common/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-common"
 
diff --git a/packages/google-cloud-common/testing/constraints-3.7.txt b/packages/google-cloud-common/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-common/testing/constraints-3.7.txt
+++ b/packages/google-cloud-common/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-compute/README.rst b/packages/google-cloud-compute/README.rst
index 770157117684..995acbfdae6d 100644
--- a/packages/google-cloud-compute/README.rst
+++ b/packages/google-cloud-compute/README.rst
@@ -15,7 +15,7 @@ Python Client for Compute Engine
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-compute.svg
    :target: https://pypi.org/project/google-cloud-compute/
 .. _Compute Engine: https://cloud.google.com/compute/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/compute/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/compute/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/compute/
 
 Quick Start
diff --git a/packages/google-cloud-compute/docs/index.rst b/packages/google-cloud-compute/docs/index.rst
index 6f540efe5c74..832e24c1f411 100644
--- a/packages/google-cloud-compute/docs/index.rst
+++ b/packages/google-cloud-compute/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-compute`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-compute/docs/summary_overview.md b/packages/google-cloud-compute/docs/summary_overview.md
new file mode 100644
index 000000000000..f50ccdfbc762
--- /dev/null
+++ b/packages/google-cloud-compute/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Compute Engine API
+
+Overview of the APIs available for Compute Engine API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Compute Engine API.
+
+[classes](https://cloud.google.com/python/docs/reference/compute/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/compute/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/compute/latest/summary_property.html)
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/accelerator_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/accelerator_types/transports/base.py
index 871ca1bd9435..4de4ae139b49 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/accelerator_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/accelerator_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/addresses/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/addresses/transports/base.py
index a90caa52cb2d..959b43bec228 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/addresses/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/addresses/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/autoscalers/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/autoscalers/transports/base.py
index 0efc74fe7707..c219e38cf0d6 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/autoscalers/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/autoscalers/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_buckets/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_buckets/transports/base.py
index 08121379a184..971fa7bf54c8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_buckets/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_buckets/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_services/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_services/transports/base.py
index aa09dd4dd7c9..2cbb302e484e 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_services/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/backend_services/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/disk_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/disk_types/transports/base.py
index b2d42ed0a659..c8f267df84b4 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/disk_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/disk_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/disks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/disks/transports/base.py
index e95a48bdf61a..d94f784dea4d 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/disks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/disks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/external_vpn_gateways/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/external_vpn_gateways/transports/base.py
index 7425edce058c..2a1af8bc57f8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/external_vpn_gateways/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/external_vpn_gateways/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/firewall_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/firewall_policies/transports/base.py
index 7ec9ca64ebd8..735ab04fa2ee 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/firewall_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/firewall_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/firewalls/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/firewalls/transports/base.py
index 6a66732ad4bd..de0ccad111e1 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/firewalls/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/firewalls/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/forwarding_rules/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/forwarding_rules/transports/base.py
index cc1b965127f1..7b4b8f8109fb 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/forwarding_rules/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/forwarding_rules/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_addresses/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_addresses/transports/base.py
index b0615b0633c5..e43f6823cb37 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_addresses/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_addresses/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_forwarding_rules/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_forwarding_rules/transports/base.py
index a97a826aa36e..30a4124ca1d4 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_forwarding_rules/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_forwarding_rules/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_network_endpoint_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_network_endpoint_groups/transports/base.py
index 0d445b8e82c1..a19ff23943d0 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_network_endpoint_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_network_endpoint_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_operations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_operations/transports/base.py
index 5ac3a85c13c8..6a9320c9422e 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_operations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_operations/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_organization_operations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_organization_operations/transports/base.py
index c081c8b87f01..661fd9708abe 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_organization_operations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_organization_operations/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_public_delegated_prefixes/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_public_delegated_prefixes/transports/base.py
index 0c6375b2d39d..2c43fd32c9d6 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/global_public_delegated_prefixes/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/global_public_delegated_prefixes/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/health_checks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/health_checks/transports/base.py
index f96d6c9a8eee..f1f1b7da37d4 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/health_checks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/health_checks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/image_family_views/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/image_family_views/transports/base.py
index 4efc532d95bd..5817bc9b4e7e 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/image_family_views/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/image_family_views/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/images/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/images/transports/base.py
index b918735575da..a951fd99cde1 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/images/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/images/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_manager_resize_requests/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_manager_resize_requests/transports/base.py
index d755d91c4440..e8036f1c0ade 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_manager_resize_requests/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_manager_resize_requests/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_managers/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_managers/transports/base.py
index 4d64436b9d94..726de97d5022 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_managers/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_group_managers/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_groups/transports/base.py
index c850eff182ad..dd6e6aa75ef9 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_settings_service/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_settings_service/transports/base.py
index a1ba166f0c68..9d825b4a1856 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_settings_service/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_settings_service/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_templates/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_templates/transports/base.py
index fa611fdbbbee..25af595c1252 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_templates/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instance_templates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instances/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instances/transports/base.py
index 2bdc089497c1..9b764b1e9d41 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instances/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instances/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/instant_snapshots/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/instant_snapshots/transports/base.py
index 2ce10cfbe0a2..8a6ce0cff6cd 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/instant_snapshots/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/instant_snapshots/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_attachments/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_attachments/transports/base.py
index 36bcc7fbbc3c..13ea31a2a6cb 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_attachments/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_attachments/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_locations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_locations/transports/base.py
index 8e9b274d5dba..38bde45d7271 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_locations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_locations/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_remote_locations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_remote_locations/transports/base.py
index 65cec1950ac2..400e9ddcba3f 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_remote_locations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnect_remote_locations/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnects/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnects/transports/base.py
index b8c0e652d396..d277aebf510d 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnects/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/interconnects/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/license_codes/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/license_codes/transports/base.py
index 9b650c6b5c2b..b64cc1e1319c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/license_codes/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/license_codes/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/licenses/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/licenses/transports/base.py
index 59d385405de8..8d31bb4071a8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/licenses/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/licenses/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_images/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_images/transports/base.py
index 7861bb5e3b84..febe1eceedb3 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_images/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_images/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_types/transports/base.py
index bce4486562d5..fed7410d591d 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/machine_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_attachments/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_attachments/transports/base.py
index 3a12d58ec8e6..add9fb7e1b91 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_attachments/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_attachments/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_edge_security_services/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_edge_security_services/transports/base.py
index 430a3bec2469..b24e48ddb7e8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_edge_security_services/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_edge_security_services/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_endpoint_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_endpoint_groups/transports/base.py
index 811c54809901..0577f8de6053 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_endpoint_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_endpoint_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_firewall_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_firewall_policies/transports/base.py
index 4110ffb139b0..369cd9dbabe5 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/network_firewall_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/network_firewall_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/networks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/networks/transports/base.py
index 553470b2c3cd..8ba491a4a2b9 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/networks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/networks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_groups/transports/base.py
index 229a406ee164..8267e283656f 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_templates/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_templates/transports/base.py
index 6e148c64a295..e3290934ac19 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_templates/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_templates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_types/transports/base.py
index 3b29551c54d3..c05deabdba38 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/node_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/node_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/packet_mirrorings/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/packet_mirrorings/transports/base.py
index 40451cac75c4..39f35875a0f6 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/packet_mirrorings/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/packet_mirrorings/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/projects/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/projects/transports/base.py
index b2095bca8c96..9bc3db7c6edd 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/projects/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/projects/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/public_advertised_prefixes/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/public_advertised_prefixes/transports/base.py
index 299ff93521dc..ab5241c6a272 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/public_advertised_prefixes/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/public_advertised_prefixes/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/public_delegated_prefixes/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/public_delegated_prefixes/transports/base.py
index 105e9f2ffd36..cf6295c189fe 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/public_delegated_prefixes/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/public_delegated_prefixes/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_autoscalers/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_autoscalers/transports/base.py
index 7c881f8f856a..344ad08bf36c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_autoscalers/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_autoscalers/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_backend_services/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_backend_services/transports/base.py
index 35e741cae067..8596ffcfdd7b 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_backend_services/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_backend_services/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_commitments/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_commitments/transports/base.py
index 5c890f084444..5861ad80db04 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_commitments/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_commitments/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disk_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disk_types/transports/base.py
index 87fb70db55fc..856ed7b23fe8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disk_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disk_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disks/transports/base.py
index c3730dbbdc18..f5041bcffc69 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_disks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_check_services/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_check_services/transports/base.py
index fdfc911a0c6e..875f91e8559c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_check_services/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_check_services/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_checks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_checks/transports/base.py
index d41c426f2426..744fa5e18e13 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_checks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_health_checks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_group_managers/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_group_managers/transports/base.py
index 6ce215c5e409..1e89c42ce33a 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_group_managers/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_group_managers/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_groups/transports/base.py
index e5238b9a8ee7..d1a1c084002c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_templates/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_templates/transports/base.py
index 5b950e3ba819..8b899535f0ed 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_templates/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instance_templates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instances/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instances/transports/base.py
index 0303099d9953..2ad6e873a35c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instances/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instances/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instant_snapshots/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instant_snapshots/transports/base.py
index 76b8c7f758ec..e9e3dd23df3d 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instant_snapshots/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_instant_snapshots/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_endpoint_groups/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_endpoint_groups/transports/base.py
index 8bd6565a6615..898f44871d77 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_endpoint_groups/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_endpoint_groups/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_firewall_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_firewall_policies/transports/base.py
index af3607cd8f5b..fa89b865676d 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_firewall_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_network_firewall_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_notification_endpoints/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_notification_endpoints/transports/base.py
index f2f3691321db..d4b7a4585340 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_notification_endpoints/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_notification_endpoints/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_operations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_operations/transports/base.py
index 6babd7586365..e2ed59747319 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_operations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_operations/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_security_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_security_policies/transports/base.py
index d9baf00a0d21..729b109fbec2 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_security_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_security_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_certificates/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_certificates/transports/base.py
index af029d9ed4e0..ee0176902fd6 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_certificates/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_certificates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_policies/transports/base.py
index 8cec96923dd5..0478e05e0f37 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_ssl_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_http_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_http_proxies/transports/base.py
index 4f078b1c994c..8b48e53d0a51 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_http_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_http_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_https_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_https_proxies/transports/base.py
index bb8ed953ea83..e29410525ad5 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_https_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_https_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_tcp_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_tcp_proxies/transports/base.py
index b554ce7bbe35..190ea7357194 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_tcp_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_target_tcp_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_url_maps/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_url_maps/transports/base.py
index 0dd6d084011c..fcfd2c9ff70b 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_url_maps/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_url_maps/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_zones/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_zones/transports/base.py
index 52d080337ded..72c63b5676ab 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/region_zones/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/region_zones/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/regions/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/regions/transports/base.py
index 53a54ad02b21..b904a5b622ec 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/regions/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/regions/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/reservations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/reservations/transports/base.py
index 4ace2eb4db6f..82a67ca016f5 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/reservations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/reservations/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/resource_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/resource_policies/transports/base.py
index ea7b4b264fb7..99f8b70f18a4 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/resource_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/resource_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/routers/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/routers/transports/base.py
index 6ef693045b35..2df5c9e1b7c0 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/routers/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/routers/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/routes/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/routes/transports/base.py
index 620d9fd3fd95..6079c5008dc2 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/routes/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/routes/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/security_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/security_policies/transports/base.py
index b6dfab9d25c4..ea81102e0df0 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/security_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/security_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/service_attachments/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/service_attachments/transports/base.py
index 82f91b9952ee..148e66058734 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/service_attachments/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/service_attachments/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshot_settings_service/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshot_settings_service/transports/base.py
index c12acaad9cf7..4d84343f574a 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshot_settings_service/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshot_settings_service/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshots/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshots/transports/base.py
index efaae6ef9133..cc13ced50583 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshots/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/snapshots/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_certificates/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_certificates/transports/base.py
index b69ffd8a2474..cafa1d14953c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_certificates/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_certificates/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_policies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_policies/transports/base.py
index 6584931de5cd..3a970cafc4d7 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_policies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/ssl_policies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pool_types/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pool_types/transports/base.py
index cda4e1f198f3..359c7c6e4eb8 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pool_types/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pool_types/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pools/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pools/transports/base.py
index 2c2ed56927f4..cd31f23eee00 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pools/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/storage_pools/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/subnetworks/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/subnetworks/transports/base.py
index b67bedc8a66c..885a70687f2f 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/subnetworks/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/subnetworks/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_grpc_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_grpc_proxies/transports/base.py
index 85dcbdc8ee43..b064eb5e3ec6 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_grpc_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_grpc_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_http_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_http_proxies/transports/base.py
index 0eac854d440b..0507cc14cb5a 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_http_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_http_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_https_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_https_proxies/transports/base.py
index b5a389ac3d5e..ca26d727eda1 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_https_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_https_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_instances/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_instances/transports/base.py
index ce531717bd87..7a99e2fc6bbe 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_instances/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_instances/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_pools/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_pools/transports/base.py
index 4d7da1ca3f85..b31014c65706 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_pools/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_pools/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_ssl_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_ssl_proxies/transports/base.py
index 59eb362e8bae..8a90b4f01afe 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_ssl_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_ssl_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_tcp_proxies/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_tcp_proxies/transports/base.py
index af1a8a8294f4..b45257f33e2c 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_tcp_proxies/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_tcp_proxies/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_vpn_gateways/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_vpn_gateways/transports/base.py
index 6552a6628f4e..e572e57e4481 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/target_vpn_gateways/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/target_vpn_gateways/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/url_maps/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/url_maps/transports/base.py
index f5701b336284..19ddaeb0804e 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/url_maps/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/url_maps/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_gateways/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_gateways/transports/base.py
index 7bb4baee3233..1feb3743c3e5 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_gateways/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_gateways/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_tunnels/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_tunnels/transports/base.py
index af359db846f5..97124f32bdff 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_tunnels/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/vpn_tunnels/transports/base.py
@@ -86,6 +86,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -98,7 +100,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/zone_operations/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/zone_operations/transports/base.py
index 03e933707772..4473313057f2 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/zone_operations/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/zone_operations/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/google/cloud/compute_v1/services/zones/transports/base.py b/packages/google-cloud-compute/google/cloud/compute_v1/services/zones/transports/base.py
index 77f3ae0f38cc..30152c32b19b 100644
--- a/packages/google-cloud-compute/google/cloud/compute_v1/services/zones/transports/base.py
+++ b/packages/google-cloud-compute/google/cloud/compute_v1/services/zones/transports/base.py
@@ -85,6 +85,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -97,7 +99,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-compute/noxfile.py b/packages/google-cloud-compute/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-compute/noxfile.py
+++ b/packages/google-cloud-compute/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-compute/setup.py b/packages/google-cloud-compute/setup.py
index a575d0621e49..b08fc335c952 100644
--- a/packages/google-cloud-compute/setup.py
+++ b/packages/google-cloud-compute/setup.py
@@ -44,7 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-compute"
 
diff --git a/packages/google-cloud-compute/testing/constraints-3.7.txt b/packages/google-cloud-compute/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-compute/testing/constraints-3.7.txt
+++ b/packages/google-cloud-compute/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-service-control/README.rst b/packages/google-cloud-service-control/README.rst
index 3be31bfcc51f..24afca7b84c2 100644
--- a/packages/google-cloud-service-control/README.rst
+++ b/packages/google-cloud-service-control/README.rst
@@ -15,7 +15,7 @@ Python Client for Service Control
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-service-control.svg
    :target: https://pypi.org/project/google-cloud-service-control/
 .. _Service Control: https://cloud.google.com/service-infrastructure/docs/overview/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/servicecontrol/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/servicecontrol/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/service-infrastructure/docs/overview/
 
 Quick Start
diff --git a/packages/google-cloud-service-control/docs/index.rst b/packages/google-cloud-service-control/docs/index.rst
index 9c514e56e32c..10c6b8cbc60e 100644
--- a/packages/google-cloud-service-control/docs/index.rst
+++ b/packages/google-cloud-service-control/docs/index.rst
@@ -32,3 +32,8 @@ For a list of all ``google-cloud-service-control`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-service-control/docs/summary_overview.md b/packages/google-cloud-service-control/docs/summary_overview.md
new file mode 100644
index 000000000000..374af7c5af31
--- /dev/null
+++ b/packages/google-cloud-service-control/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Service Control API
+
+Overview of the APIs available for Service Control API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Service Control API.
+
+[classes](https://cloud.google.com/python/docs/reference/servicecontrol/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/servicecontrol/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/servicecontrol/latest/summary_property.html)
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/base.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/base.py
index 7a6f3df3ac31..5f19c75cf2f1 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/base.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc.py
index 2f2613de2a85..6695fe0998b0 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc_asyncio.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc_asyncio.py
index 0c29341926d1..2e46e2034d02 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc_asyncio.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/quota_controller/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/base.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/base.py
index e4ae0d63b458..13a2838a72e0 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/base.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/base.py
@@ -84,6 +84,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -96,7 +98,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc.py
index 917e1dd72243..73809fad8b3d 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc.py
@@ -124,7 +124,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc_asyncio.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc_asyncio.py
index f62e85286558..e1b122a5b80e 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc_asyncio.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/services/service_controller/transports/grpc_asyncio.py
@@ -171,7 +171,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/types/service_controller.py b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/types/service_controller.py
index 93b6d50fbbd8..2ee129a72b45 100644
--- a/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/types/service_controller.py
+++ b/packages/google-cloud-service-control/google/cloud/servicecontrol_v1/types/service_controller.py
@@ -137,7 +137,7 @@ class ConsumerInfo(proto.Message):
             project_number (int):
                 The Google cloud project number, e.g.
                 1234567890. A value of 0 indicates no project
-                number is found.
+                    number is found.
 
                 NOTE: This field is deprecated after we support
                 flexible consumer id. New code should not depend
diff --git a/packages/google-cloud-service-control/noxfile.py b/packages/google-cloud-service-control/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-service-control/noxfile.py
+++ b/packages/google-cloud-service-control/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-service-control/setup.py b/packages/google-cloud-service-control/setup.py
index 4baf836b5bd2..12b077065966 100644
--- a/packages/google-cloud-service-control/setup.py
+++ b/packages/google-cloud-service-control/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-service-control"
 
diff --git a/packages/google-cloud-service-control/testing/constraints-3.7.txt b/packages/google-cloud-service-control/testing/constraints-3.7.txt
index b8a550c73855..fc812592b0ee 100644
--- a/packages/google-cloud-service-control/testing/constraints-3.7.txt
+++ b/packages/google-cloud-service-control/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
diff --git a/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_quota_controller.py b/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_quota_controller.py
index 9380f84a3262..53278963737a 100644
--- a/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_quota_controller.py
+++ b/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_quota_controller.py
@@ -1315,12 +1315,7 @@ async def test_allocate_quota_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.allocate_quota
         ] = mock_object
diff --git a/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_service_controller.py b/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_service_controller.py
index 6b49a8833ac7..dcae7086a79d 100644
--- a/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_service_controller.py
+++ b/packages/google-cloud-service-control/tests/unit/gapic/servicecontrol_v1/test_service_controller.py
@@ -1340,12 +1340,7 @@ async def test_check_async_use_cached_wrapped_rpc(transport: str = "grpc_asyncio
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.check
         ] = mock_object
@@ -1634,12 +1629,7 @@ async def test_report_async_use_cached_wrapped_rpc(transport: str = "grpc_asynci
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.report
         ] = mock_object
diff --git a/packages/google-cloud-service-management/README.rst b/packages/google-cloud-service-management/README.rst
index 4d11e0bcb1f2..fb364280c9c1 100644
--- a/packages/google-cloud-service-management/README.rst
+++ b/packages/google-cloud-service-management/README.rst
@@ -15,7 +15,7 @@ Python Client for Service Management
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-service-management.svg
    :target: https://pypi.org/project/google-cloud-service-management/
 .. _Service Management: https://cloud.google.com/service-infrastructure/docs/overview/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/servicemanagement/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/servicemanagement/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/service-infrastructure/docs/overview/
 
 Quick Start
diff --git a/packages/google-cloud-service-management/docs/index.rst b/packages/google-cloud-service-management/docs/index.rst
index c467f3b02766..c32914cfb61e 100644
--- a/packages/google-cloud-service-management/docs/index.rst
+++ b/packages/google-cloud-service-management/docs/index.rst
@@ -21,3 +21,8 @@ For a list of all ``google-cloud-service-management`` releases:
     :maxdepth: 2
 
     CHANGELOG
+
+.. toctree::
+  :hidden:
+
+  summary_overview.md
diff --git a/packages/google-cloud-service-management/docs/summary_overview.md b/packages/google-cloud-service-management/docs/summary_overview.md
new file mode 100644
index 000000000000..e89b77a486e9
--- /dev/null
+++ b/packages/google-cloud-service-management/docs/summary_overview.md
@@ -0,0 +1,22 @@
+[
+This is a templated file. Adding content to this file may result in it being
+reverted. Instead, if you want to place additional content, create an
+"overview_content.md" file in `docs/` directory. The Sphinx tool will
+pick up on the content and merge the content.
+]: #
+
+# Service Management API
+
+Overview of the APIs available for Service Management API.
+
+## All entries
+
+Classes, methods and properties & attributes for
+Service Management API.
+
+[classes](https://cloud.google.com/python/docs/reference/servicemanagement/latest/summary_class.html)
+
+[methods](https://cloud.google.com/python/docs/reference/servicemanagement/latest/summary_method.html)
+
+[properties and
+attributes](https://cloud.google.com/python/docs/reference/servicemanagement/latest/summary_property.html)
diff --git a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/base.py b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/base.py
index 0e581e7d87d7..30cebb904902 100644
--- a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/base.py
+++ b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/base.py
@@ -90,6 +90,8 @@ def __init__(
 
         # Save the scopes.
         self._scopes = scopes
+        if not hasattr(self, "_ignore_credentials"):
+            self._ignore_credentials: bool = False
 
         # If no credentials are provided, then determine the appropriate
         # defaults.
@@ -102,7 +104,7 @@ def __init__(
             credentials, _ = google.auth.load_credentials_from_file(
                 credentials_file, **scopes_kwargs, quota_project_id=quota_project_id
             )
-        elif credentials is None:
+        elif credentials is None and not self._ignore_credentials:
             credentials, _ = google.auth.default(
                 **scopes_kwargs, quota_project_id=quota_project_id
             )
diff --git a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc.py b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc.py
index 6579135ed451..dfa7d8015709 100644
--- a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc.py
+++ b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc.py
@@ -127,7 +127,8 @@ def __init__(
 
         if isinstance(channel, grpc.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc_asyncio.py b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc_asyncio.py
index 7e47be322f2e..4888903a2b49 100644
--- a/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc_asyncio.py
+++ b/packages/google-cloud-service-management/google/cloud/servicemanagement_v1/services/service_manager/transports/grpc_asyncio.py
@@ -174,7 +174,8 @@ def __init__(
 
         if isinstance(channel, aio.Channel):
             # Ignore credentials if a channel was passed.
-            credentials = False
+            credentials = None
+            self._ignore_credentials = True
             # If a channel was explicitly provided, set it.
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
diff --git a/packages/google-cloud-service-management/noxfile.py b/packages/google-cloud-service-management/noxfile.py
index 1e6cd48d0529..67b7265f7586 100644
--- a/packages/google-cloud-service-management/noxfile.py
+++ b/packages/google-cloud-service-management/noxfile.py
@@ -160,14 +160,28 @@ def install_unittest_dependencies(session, *constraints):
         session.install("-e", ".", *constraints)
 
 
-def default(session):
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
     install_unittest_dependencies(session, "-c", constraints_path)
 
+    # TODO(https://github.com/googleapis/synthtool/issues/1976):
+    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
+    # The 'cpp' implementation requires Protobuf<4.
+    if protobuf_implementation == "cpp":
+        session.install("protobuf<4")
+
     # Run py.test against the unit tests.
     session.run(
         "py.test",
@@ -181,15 +195,12 @@ def default(session):
         "--cov-fail-under=0",
         os.path.join("tests", "unit"),
         *session.posargs,
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session)
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.
@@ -358,9 +369,16 @@ def docfx(session):
 
 
 @nox.session(python="3.12")
-def prerelease_deps(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb", "cpp"],
+)
+def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+        session.skip("cpp implementation is not supported in python 3.11+")
+
     # Install all dependencies
     session.install("-e", ".[all, tests, tracing]")
     unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
@@ -397,9 +415,9 @@ def prerelease_deps(session):
         "protobuf",
         # dependency of grpc
         "six",
+        "grpc-google-iam-v1",
         "googleapis-common-protos",
-        # Exclude version 1.52.0rc1 which has a known issue. See https://github.com/grpc/grpc/issues/32163
-        "grpcio!=1.52.0rc1",
+        "grpcio",
         "grpcio-status",
         "google-api-core",
         "google-auth",
@@ -425,4 +443,10 @@ def prerelease_deps(session):
     session.run("python", "-c", "import grpc; print(grpc.__version__)")
     session.run("python", "-c", "import google.auth; print(google.auth.__version__)")
 
-    session.run("py.test", "tests/unit")
+    session.run(
+        "py.test",
+        "tests/unit",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
diff --git a/packages/google-cloud-service-management/setup.py b/packages/google-cloud-service-management/setup.py
index 34aa2820396a..1673d0ea062d 100644
--- a/packages/google-cloud-service-management/setup.py
+++ b/packages/google-cloud-service-management/setup.py
@@ -46,7 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
-    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
+    "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
 url = "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-service-management"
diff --git a/packages/google-cloud-service-management/testing/constraints-3.7.txt b/packages/google-cloud-service-management/testing/constraints-3.7.txt
index 4cd2782277d4..a81fb6bcd05c 100644
--- a/packages/google-cloud-service-management/testing/constraints-3.7.txt
+++ b/packages/google-cloud-service-management/testing/constraints-3.7.txt
@@ -7,5 +7,5 @@
 google-api-core==1.34.1
 google-auth==2.14.1
 proto-plus==1.22.3
-protobuf==3.19.5
+protobuf==3.20.2
 grpc-google-iam-v1==0.12.4
diff --git a/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py b/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
index 9529efbb4987..3410826d7cb0 100644
--- a/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
+++ b/packages/google-cloud-service-management/tests/unit/gapic/servicemanagement_v1/test_service_manager.py
@@ -1332,12 +1332,7 @@ async def test_list_services_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_services
         ] = mock_object
@@ -1840,12 +1835,7 @@ async def test_get_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service
         ] = mock_object
@@ -2206,12 +2196,7 @@ async def test_create_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_service
         ] = mock_object
@@ -2514,12 +2499,7 @@ async def test_delete_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.delete_service
         ] = mock_object
@@ -2885,12 +2865,7 @@ async def test_undelete_service_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.undelete_service
         ] = mock_object
@@ -3269,12 +3244,7 @@ async def test_list_service_configs_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_service_configs
         ] = mock_object
@@ -3870,12 +3840,7 @@ async def test_get_service_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service_config
         ] = mock_object
@@ -4295,12 +4260,7 @@ async def test_create_service_config_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_service_config
         ] = mock_object
@@ -4698,12 +4658,7 @@ async def test_submit_config_source_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.submit_config_source
         ] = mock_object
@@ -5116,12 +5071,7 @@ async def test_list_service_rollouts_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.list_service_rollouts
         ] = mock_object
@@ -5727,12 +5677,7 @@ async def test_get_service_rollout_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.get_service_rollout
         ] = mock_object
@@ -6133,12 +6078,7 @@ async def test_create_service_rollout_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.create_service_rollout
         ] = mock_object
@@ -6536,12 +6476,7 @@ async def test_generate_config_report_async_use_cached_wrapped_rpc(
         )
 
         # Replace cached wrapped function with mock
-        class AwaitableMock(mock.AsyncMock):
-            def __await__(self):
-                self.await_count += 1
-                return iter([])
-
-        mock_object = AwaitableMock()
+        mock_object = mock.AsyncMock()
         client._client._transport._wrapped_methods[
             client._client._transport.generate_config_report
         ] = mock_object