diff --git a/CHANGELOG.md b/CHANGELOG.md
index b46536cfc7c..8d9fa32a15b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Release v1.44.304 (2023-07-20)
+===
+
+### Service Client Updates
+* `service/savingsplans`: Updates service documentation
+
 Release v1.44.303 (2023-07-19)
 ===
 
diff --git a/aws/endpoints/defaults.go b/aws/endpoints/defaults.go
index aedb4f56a32..c875912ade4 100644
--- a/aws/endpoints/defaults.go
+++ b/aws/endpoints/defaults.go
@@ -37848,20 +37848,6 @@ var awsusgovPartition = partition{
 				}: endpoint{},
 			},
 		},
-		"savingsplans": service{
-			PartitionEndpoint: "aws-us-gov-global",
-			IsRegionalized:    boxedFalse,
-			Endpoints: serviceEndpoints{
-				endpointKey{
-					Region: "aws-us-gov-global",
-				}: endpoint{
-					Hostname: "savingsplans.amazonaws.com",
-					CredentialScope: credentialScope{
-						Region: "us-gov-west-1",
-					},
-				},
-			},
-		},
 		"secretsmanager": service{
 			Endpoints: serviceEndpoints{
 				endpointKey{
diff --git a/aws/version.go b/aws/version.go
index 2654f65574d..6e7f262b2ec 100644
--- a/aws/version.go
+++ b/aws/version.go
@@ -5,4 +5,4 @@ package aws
 const SDKName = "aws-sdk-go"
 
 // SDKVersion is the version of this SDK
-const SDKVersion = "1.44.303"
+const SDKVersion = "1.44.304"
diff --git a/models/apis/savingsplans/2019-06-28/docs-2.json b/models/apis/savingsplans/2019-06-28/docs-2.json
index 251f0d2f77a..9dfb53c6f42 100644
--- a/models/apis/savingsplans/2019-06-28/docs-2.json
+++ b/models/apis/savingsplans/2019-06-28/docs-2.json
@@ -181,7 +181,7 @@
       "base": null,
       "refs": {
         "DescribeSavingsPlanRatesRequest$nextToken": "<p>The token for the next page of results.</p>",
-        "DescribeSavingsPlanRatesResponse$nextToken": "<p>The token to use to retrieve the next page of results. This value is null when there are no more results to return.</p>",
+        "DescribeSavingsPlanRatesResponse$nextToken": "<p>The token to use to retrieve the next page of results. This value is null when there are no more results to return. </p>",
         "DescribeSavingsPlansOfferingRatesRequest$nextToken": "<p>The token for the next page of results.</p>",
         "DescribeSavingsPlansOfferingRatesResponse$nextToken": "<p>The token to use to retrieve the next page of results. This value is null when there are no more results to return.</p>",
         "DescribeSavingsPlansOfferingsRequest$nextToken": "<p>The token for the next page of results.</p>",
diff --git a/models/apis/savingsplans/2019-06-28/endpoint-rule-set-1.json b/models/apis/savingsplans/2019-06-28/endpoint-rule-set-1.json
new file mode 100644
index 00000000000..e34bb65d649
--- /dev/null
+++ b/models/apis/savingsplans/2019-06-28/endpoint-rule-set-1.json
@@ -0,0 +1,401 @@
+{
+    "version": "1.0",
+    "parameters": {
+        "Region": {
+            "builtIn": "AWS::Region",
+            "required": false,
+            "documentation": "The AWS region used to dispatch the request.",
+            "type": "String"
+        },
+        "UseDualStack": {
+            "builtIn": "AWS::UseDualStack",
+            "required": true,
+            "default": false,
+            "documentation": "When true, use the dual-stack endpoint. If the configured endpoint does not support dual-stack, dispatching the request MAY return an error.",
+            "type": "Boolean"
+        },
+        "UseFIPS": {
+            "builtIn": "AWS::UseFIPS",
+            "required": true,
+            "default": false,
+            "documentation": "When true, send this request to the FIPS-compliant regional endpoint. If the configured endpoint does not have a FIPS compliant endpoint, dispatching the request will return an error.",
+            "type": "Boolean"
+        },
+        "Endpoint": {
+            "builtIn": "SDK::Endpoint",
+            "required": false,
+            "documentation": "Override the endpoint used to send this request",
+            "type": "String"
+        }
+    },
+    "rules": [
+        {
+            "conditions": [
+                {
+                    "fn": "isSet",
+                    "argv": [
+                        {
+                            "ref": "Endpoint"
+                        }
+                    ]
+                }
+            ],
+            "type": "tree",
+            "rules": [
+                {
+                    "conditions": [
+                        {
+                            "fn": "booleanEquals",
+                            "argv": [
+                                {
+                                    "ref": "UseFIPS"
+                                },
+                                true
+                            ]
+                        }
+                    ],
+                    "error": "Invalid Configuration: FIPS and custom endpoint are not supported",
+                    "type": "error"
+                },
+                {
+                    "conditions": [],
+                    "type": "tree",
+                    "rules": [
+                        {
+                            "conditions": [
+                                {
+                                    "fn": "booleanEquals",
+                                    "argv": [
+                                        {
+                                            "ref": "UseDualStack"
+                                        },
+                                        true
+                                    ]
+                                }
+                            ],
+                            "error": "Invalid Configuration: Dualstack and custom endpoint are not supported",
+                            "type": "error"
+                        },
+                        {
+                            "conditions": [],
+                            "endpoint": {
+                                "url": {
+                                    "ref": "Endpoint"
+                                },
+                                "properties": {},
+                                "headers": {}
+                            },
+                            "type": "endpoint"
+                        }
+                    ]
+                }
+            ]
+        },
+        {
+            "conditions": [],
+            "type": "tree",
+            "rules": [
+                {
+                    "conditions": [
+                        {
+                            "fn": "isSet",
+                            "argv": [
+                                {
+                                    "ref": "Region"
+                                }
+                            ]
+                        }
+                    ],
+                    "type": "tree",
+                    "rules": [
+                        {
+                            "conditions": [
+                                {
+                                    "fn": "aws.partition",
+                                    "argv": [
+                                        {
+                                            "ref": "Region"
+                                        }
+                                    ],
+                                    "assign": "PartitionResult"
+                                }
+                            ],
+                            "type": "tree",
+                            "rules": [
+                                {
+                                    "conditions": [
+                                        {
+                                            "fn": "stringEquals",
+                                            "argv": [
+                                                {
+                                                    "fn": "getAttr",
+                                                    "argv": [
+                                                        {
+                                                            "ref": "PartitionResult"
+                                                        },
+                                                        "name"
+                                                    ]
+                                                },
+                                                "aws"
+                                            ]
+                                        },
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseFIPS"
+                                                },
+                                                false
+                                            ]
+                                        },
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseDualStack"
+                                                },
+                                                false
+                                            ]
+                                        }
+                                    ],
+                                    "endpoint": {
+                                        "url": "https://savingsplans.amazonaws.com",
+                                        "properties": {
+                                            "authSchemes": [
+                                                {
+                                                    "name": "sigv4",
+                                                    "signingName": "savingsplans",
+                                                    "signingRegion": "us-east-1"
+                                                }
+                                            ]
+                                        },
+                                        "headers": {}
+                                    },
+                                    "type": "endpoint"
+                                },
+                                {
+                                    "conditions": [
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseFIPS"
+                                                },
+                                                true
+                                            ]
+                                        },
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseDualStack"
+                                                },
+                                                true
+                                            ]
+                                        }
+                                    ],
+                                    "type": "tree",
+                                    "rules": [
+                                        {
+                                            "conditions": [
+                                                {
+                                                    "fn": "booleanEquals",
+                                                    "argv": [
+                                                        true,
+                                                        {
+                                                            "fn": "getAttr",
+                                                            "argv": [
+                                                                {
+                                                                    "ref": "PartitionResult"
+                                                                },
+                                                                "supportsFIPS"
+                                                            ]
+                                                        }
+                                                    ]
+                                                },
+                                                {
+                                                    "fn": "booleanEquals",
+                                                    "argv": [
+                                                        true,
+                                                        {
+                                                            "fn": "getAttr",
+                                                            "argv": [
+                                                                {
+                                                                    "ref": "PartitionResult"
+                                                                },
+                                                                "supportsDualStack"
+                                                            ]
+                                                        }
+                                                    ]
+                                                }
+                                            ],
+                                            "type": "tree",
+                                            "rules": [
+                                                {
+                                                    "conditions": [],
+                                                    "type": "tree",
+                                                    "rules": [
+                                                        {
+                                                            "conditions": [],
+                                                            "endpoint": {
+                                                                "url": "https://savingsplans-fips.{Region}.{PartitionResult#dualStackDnsSuffix}",
+                                                                "properties": {},
+                                                                "headers": {}
+                                                            },
+                                                            "type": "endpoint"
+                                                        }
+                                                    ]
+                                                }
+                                            ]
+                                        },
+                                        {
+                                            "conditions": [],
+                                            "error": "FIPS and DualStack are enabled, but this partition does not support one or both",
+                                            "type": "error"
+                                        }
+                                    ]
+                                },
+                                {
+                                    "conditions": [
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseFIPS"
+                                                },
+                                                true
+                                            ]
+                                        }
+                                    ],
+                                    "type": "tree",
+                                    "rules": [
+                                        {
+                                            "conditions": [
+                                                {
+                                                    "fn": "booleanEquals",
+                                                    "argv": [
+                                                        true,
+                                                        {
+                                                            "fn": "getAttr",
+                                                            "argv": [
+                                                                {
+                                                                    "ref": "PartitionResult"
+                                                                },
+                                                                "supportsFIPS"
+                                                            ]
+                                                        }
+                                                    ]
+                                                }
+                                            ],
+                                            "type": "tree",
+                                            "rules": [
+                                                {
+                                                    "conditions": [],
+                                                    "type": "tree",
+                                                    "rules": [
+                                                        {
+                                                            "conditions": [],
+                                                            "endpoint": {
+                                                                "url": "https://savingsplans-fips.{Region}.{PartitionResult#dnsSuffix}",
+                                                                "properties": {},
+                                                                "headers": {}
+                                                            },
+                                                            "type": "endpoint"
+                                                        }
+                                                    ]
+                                                }
+                                            ]
+                                        },
+                                        {
+                                            "conditions": [],
+                                            "error": "FIPS is enabled but this partition does not support FIPS",
+                                            "type": "error"
+                                        }
+                                    ]
+                                },
+                                {
+                                    "conditions": [
+                                        {
+                                            "fn": "booleanEquals",
+                                            "argv": [
+                                                {
+                                                    "ref": "UseDualStack"
+                                                },
+                                                true
+                                            ]
+                                        }
+                                    ],
+                                    "type": "tree",
+                                    "rules": [
+                                        {
+                                            "conditions": [
+                                                {
+                                                    "fn": "booleanEquals",
+                                                    "argv": [
+                                                        true,
+                                                        {
+                                                            "fn": "getAttr",
+                                                            "argv": [
+                                                                {
+                                                                    "ref": "PartitionResult"
+                                                                },
+                                                                "supportsDualStack"
+                                                            ]
+                                                        }
+                                                    ]
+                                                }
+                                            ],
+                                            "type": "tree",
+                                            "rules": [
+                                                {
+                                                    "conditions": [],
+                                                    "type": "tree",
+                                                    "rules": [
+                                                        {
+                                                            "conditions": [],
+                                                            "endpoint": {
+                                                                "url": "https://savingsplans.{Region}.{PartitionResult#dualStackDnsSuffix}",
+                                                                "properties": {},
+                                                                "headers": {}
+                                                            },
+                                                            "type": "endpoint"
+                                                        }
+                                                    ]
+                                                }
+                                            ]
+                                        },
+                                        {
+                                            "conditions": [],
+                                            "error": "DualStack is enabled but this partition does not support DualStack",
+                                            "type": "error"
+                                        }
+                                    ]
+                                },
+                                {
+                                    "conditions": [],
+                                    "type": "tree",
+                                    "rules": [
+                                        {
+                                            "conditions": [],
+                                            "endpoint": {
+                                                "url": "https://savingsplans.{Region}.{PartitionResult#dnsSuffix}",
+                                                "properties": {},
+                                                "headers": {}
+                                            },
+                                            "type": "endpoint"
+                                        }
+                                    ]
+                                }
+                            ]
+                        }
+                    ]
+                },
+                {
+                    "conditions": [],
+                    "error": "Invalid Configuration: Missing Region",
+                    "type": "error"
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/models/apis/savingsplans/2019-06-28/endpoint-tests-1.json b/models/apis/savingsplans/2019-06-28/endpoint-tests-1.json
new file mode 100644
index 00000000000..d59180edf11
--- /dev/null
+++ b/models/apis/savingsplans/2019-06-28/endpoint-tests-1.json
@@ -0,0 +1,345 @@
+{
+    "testCases": [
+        {
+            "documentation": "For region aws-global with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "properties": {
+                        "authSchemes": [
+                            {
+                                "name": "sigv4",
+                                "signingName": "savingsplans",
+                                "signingRegion": "us-east-1"
+                            }
+                        ]
+                    },
+                    "url": "https://savingsplans.amazonaws.com"
+                }
+            },
+            "params": {
+                "Region": "aws-global",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-east-1 with FIPS enabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-east-1.api.aws"
+                }
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": true,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-east-1 with FIPS enabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-east-1.amazonaws.com"
+                }
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": true,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-east-1 with FIPS disabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.us-east-1.api.aws"
+                }
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": false,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-east-1 with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "properties": {
+                        "authSchemes": [
+                            {
+                                "name": "sigv4",
+                                "signingName": "savingsplans",
+                                "signingRegion": "us-east-1"
+                            }
+                        ]
+                    },
+                    "url": "https://savingsplans.amazonaws.com"
+                }
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region cn-north-1 with FIPS enabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.cn-north-1.api.amazonwebservices.com.cn"
+                }
+            },
+            "params": {
+                "Region": "cn-north-1",
+                "UseFIPS": true,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region cn-north-1 with FIPS enabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.cn-north-1.amazonaws.com.cn"
+                }
+            },
+            "params": {
+                "Region": "cn-north-1",
+                "UseFIPS": true,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region cn-north-1 with FIPS disabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.cn-north-1.api.amazonwebservices.com.cn"
+                }
+            },
+            "params": {
+                "Region": "cn-north-1",
+                "UseFIPS": false,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region cn-north-1 with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.cn-north-1.amazonaws.com.cn"
+                }
+            },
+            "params": {
+                "Region": "cn-north-1",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-gov-east-1 with FIPS enabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-gov-east-1.api.aws"
+                }
+            },
+            "params": {
+                "Region": "us-gov-east-1",
+                "UseFIPS": true,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-gov-east-1 with FIPS enabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-gov-east-1.amazonaws.com"
+                }
+            },
+            "params": {
+                "Region": "us-gov-east-1",
+                "UseFIPS": true,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-gov-east-1 with FIPS disabled and DualStack enabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.us-gov-east-1.api.aws"
+                }
+            },
+            "params": {
+                "Region": "us-gov-east-1",
+                "UseFIPS": false,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-gov-east-1 with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.us-gov-east-1.amazonaws.com"
+                }
+            },
+            "params": {
+                "Region": "us-gov-east-1",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-iso-east-1 with FIPS enabled and DualStack enabled",
+            "expect": {
+                "error": "FIPS and DualStack are enabled, but this partition does not support one or both"
+            },
+            "params": {
+                "Region": "us-iso-east-1",
+                "UseFIPS": true,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-iso-east-1 with FIPS enabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-iso-east-1.c2s.ic.gov"
+                }
+            },
+            "params": {
+                "Region": "us-iso-east-1",
+                "UseFIPS": true,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-iso-east-1 with FIPS disabled and DualStack enabled",
+            "expect": {
+                "error": "DualStack is enabled but this partition does not support DualStack"
+            },
+            "params": {
+                "Region": "us-iso-east-1",
+                "UseFIPS": false,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-iso-east-1 with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.us-iso-east-1.c2s.ic.gov"
+                }
+            },
+            "params": {
+                "Region": "us-iso-east-1",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-isob-east-1 with FIPS enabled and DualStack enabled",
+            "expect": {
+                "error": "FIPS and DualStack are enabled, but this partition does not support one or both"
+            },
+            "params": {
+                "Region": "us-isob-east-1",
+                "UseFIPS": true,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-isob-east-1 with FIPS enabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans-fips.us-isob-east-1.sc2s.sgov.gov"
+                }
+            },
+            "params": {
+                "Region": "us-isob-east-1",
+                "UseFIPS": true,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For region us-isob-east-1 with FIPS disabled and DualStack enabled",
+            "expect": {
+                "error": "DualStack is enabled but this partition does not support DualStack"
+            },
+            "params": {
+                "Region": "us-isob-east-1",
+                "UseFIPS": false,
+                "UseDualStack": true
+            }
+        },
+        {
+            "documentation": "For region us-isob-east-1 with FIPS disabled and DualStack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://savingsplans.us-isob-east-1.sc2s.sgov.gov"
+                }
+            },
+            "params": {
+                "Region": "us-isob-east-1",
+                "UseFIPS": false,
+                "UseDualStack": false
+            }
+        },
+        {
+            "documentation": "For custom endpoint with region set and fips disabled and dualstack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://example.com"
+                }
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": false,
+                "UseDualStack": false,
+                "Endpoint": "https://example.com"
+            }
+        },
+        {
+            "documentation": "For custom endpoint with region not set and fips disabled and dualstack disabled",
+            "expect": {
+                "endpoint": {
+                    "url": "https://example.com"
+                }
+            },
+            "params": {
+                "UseFIPS": false,
+                "UseDualStack": false,
+                "Endpoint": "https://example.com"
+            }
+        },
+        {
+            "documentation": "For custom endpoint with fips enabled and dualstack disabled",
+            "expect": {
+                "error": "Invalid Configuration: FIPS and custom endpoint are not supported"
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": true,
+                "UseDualStack": false,
+                "Endpoint": "https://example.com"
+            }
+        },
+        {
+            "documentation": "For custom endpoint with fips disabled and dualstack enabled",
+            "expect": {
+                "error": "Invalid Configuration: Dualstack and custom endpoint are not supported"
+            },
+            "params": {
+                "Region": "us-east-1",
+                "UseFIPS": false,
+                "UseDualStack": true,
+                "Endpoint": "https://example.com"
+            }
+        },
+        {
+            "documentation": "Missing region",
+            "expect": {
+                "error": "Invalid Configuration: Missing Region"
+            }
+        }
+    ],
+    "version": "1.0"
+}
\ No newline at end of file
diff --git a/models/endpoints/endpoints.json b/models/endpoints/endpoints.json
index 23db34ba400..5062218fc05 100644
--- a/models/endpoints/endpoints.json
+++ b/models/endpoints/endpoints.json
@@ -22712,18 +22712,6 @@
           }
         }
       },
-      "savingsplans" : {
-        "endpoints" : {
-          "aws-us-gov-global" : {
-            "credentialScope" : {
-              "region" : "us-gov-west-1"
-            },
-            "hostname" : "savingsplans.amazonaws.com"
-          }
-        },
-        "isRegionalized" : false,
-        "partitionEndpoint" : "aws-us-gov-global"
-      },
       "secretsmanager" : {
         "endpoints" : {
           "us-gov-east-1" : {