diff --git a/.github/workflows/validate-openapi.yml b/.github/workflows/validate-openapi.yml
new file mode 100644
index 0000000000..118d3d4a2b
--- /dev/null
+++ b/.github/workflows/validate-openapi.yml
@@ -0,0 +1,38 @@
+name: OpenAPI Validator
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - packages/auth/src/openapi/**
+      - packages/backend/src/openapi/**
+      - packages/token-introspection/src/openapi/**
+  pull_request:
+    branches:
+      - main
+    paths:
+      - packages/auth/src/openapi/**
+      - packages/backend/src/openapi/**
+      - packages/token-introspection/src/openapi/**
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+
+      - name: Lint Open API specs
+        run: |
+          npx prettier --check packages/auth/src/openapi/id-provider.yaml
+          npx prettier --check packages/backend/src/openapi/webhooks.yaml
+          npx prettier --check packages/token-introspection/src/openapi/token-introspection.yaml
+      - name: AsyncAPI extension
+        run: |
+          echo "{\"extends\":[\"spectral:oas\",\"spectral:asyncapi\"]}" >> .spectral.json
+      - name: Validate Open API specs
+        run: |
+          npx @stoplight/spectral-cli lint packages/auth/src/openapi/id-provider.yaml
+          npx @stoplight/spectral-cli lint packages/backend/src/openapi/webhooks.yaml
+          npx @stoplight/spectral-cli lint packages/token-introspection/src/openapi/token-introspection.yaml
\ No newline at end of file
diff --git a/packages/backend/src/openapi/webhooks.yaml b/packages/backend/src/openapi/webhooks.yaml
new file mode 100644
index 0000000000..48cd647a96
--- /dev/null
+++ b/packages/backend/src/openapi/webhooks.yaml
@@ -0,0 +1,237 @@
+openapi: 3.1.0
+info:
+  title: Rafiki Webhooks
+  version: 1.0.0
+  description: 'Webhook Events fired by Rafiki'
+  contact:
+    email: tech@interledger.org
+webhooks:
+  incomingPaymentCompleted:
+    post:
+      requestBody:
+        description: Notify account servicing entity that an incoming payment was completed and funds should now be withdrawn.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/incomingPaymentEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+  incomingPaymentExpired:
+    post:
+      requestBody:
+        description: Notify account servicing entity that an incoming payment has expired and funds should now be withdrawn.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/incomingPaymentEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+  outgoingPaymentCreated:
+    post:
+      requestBody:
+        description: Notify account servicing entity that an outgoing payment was created and should now be funded.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/outgoingPaymentEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+  outgoingPaymentCompleted:
+    post:
+      requestBody:
+        description: Notify account servicing entity that an outgoing payment completed. Remaining funds should be withdrawn.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/outgoingPaymentEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+  outgoingPaymentFailed:
+    post:
+      requestBody:
+        description: Notify account servicing entity that an outgoing payment failed and won't be retried. Funds should be withdrawn.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/outgoingPaymentEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+  webMonetization:
+    post:
+      requestBody:
+        description: Notify account servicing entity that a Web Monetization payment was received and funds should be withdrawn.
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/webMonetizationEvent'
+      responses:
+        '200':
+          description: Return a 200 status to indicate that the data was received successfully
+
+components:
+  schemas:
+    incomingPaymentEvent:
+      required:
+        - id
+        - type
+        - data
+      properties:
+        id:
+          type: string
+          format: uuid
+        type:
+          type: string
+          enum:
+            - incoming_payment.completed
+            - incoming_payment.expired
+        data:
+          type: object
+          required:
+            - id
+            - paymentPointerId
+            - createdAt
+            - updatedAt
+            - expiresAt
+            - receivedAmount
+            - completed
+          properties:
+            id:
+              type: string
+              format: uuid
+            paymentPointerId:
+              type: string
+              format: uuid
+            completed:
+              type: boolean
+            incomingAmount:
+              $ref: ./schemas.yaml#/components/schemas/amount
+            receivedAmount:
+              $ref: ./schemas.yaml#/components/schemas/amount
+            description:
+              type: string
+            externalRef:
+              type: string
+            createdAt:
+              type: string
+              format: date-time
+            updatedAt:
+              type: string
+              format: date-time
+            expiresAt:
+              type: string
+              format: date-time
+      additionalProperties: false
+    outgoingPaymentEvent:
+      required:
+        - id
+        - type
+        - data
+      properties:
+        id:
+          type: string
+          format: uuid
+        type:
+          type: string
+          enum:
+            - outgoing_payment.created
+            - outgoing_payment.completed
+            - outgoing_payment.failed
+        data:
+          type: object
+          required:
+            - id
+            - paymentPointerId
+            - createdAt
+            - updatedAt
+            - expiresAt
+            - sendAmount
+            - receiveAmount
+            - state
+            - stateAttempts
+            - balance
+            - receiver
+          properties:
+            id:
+              type: string
+              format: uuid
+            paymentPointerId:
+              type: string
+              format: uuid
+            state:
+              type: string
+              enum:
+                - FUNDING
+                - SENDING
+                - FAILED
+                - COMPLETED
+            receiver:
+              type: string
+              format: uri
+            sendAmount:
+              $ref: ./schemas.yaml#/components/schemas/amount
+            sentAmount:
+              $ref: ./schemas.yaml#/components/schemas/amount
+            description:
+              type: string
+            externalRef:
+              type: string
+            createdAt:
+              type: string
+              format: date-time
+            updatedAt:
+              type: string
+              format: date-time
+            expiresAt:
+              type: string
+              format: date-time
+            error:
+              type: string
+            stateAttempts:
+              type: integer
+            balance:
+              type: string
+              format: uint64
+            peerId:
+              type: string
+              format: uuid
+      additionalProperties: false
+    webMonetizationEvent:
+      required:
+        - id
+        - type
+        - data
+      properties:
+        id:
+          type: string
+          format: uuid
+        type:
+          type: string
+          enum:
+            - payment_pointer.web_monetization
+        data:
+          type: object
+          required:
+            - paymentPointer
+          properties:
+            paymentPointer:
+              type: object
+              required:
+                - id
+                - createdAt
+                - received
+              properties:
+                id:
+                  type: string
+                  format: uuid
+                createdAt:
+                  type: string
+                  format: date-time
+                received:
+                  type: string
+                  format: uint64
+      additionalProperties: false