diff --git a/.github/workflows/api-tests.yml b/.github/workflows/api-tests.yml
index e7bf15846..82c257a83 100644
--- a/.github/workflows/api-tests.yml
+++ b/.github/workflows/api-tests.yml
@@ -48,6 +48,7 @@ env:
   DOMAIN_NAME: demo-test
   USERS_URL: http://localhost:9002
   THINGS_URL: http://localhost:9000
+  INVITATIONS_URL: http://localhost:9020
 
 jobs:
   api-test:
@@ -155,6 +156,16 @@ jobs:
           report: false
           args: '--header "Authorization: Bearer ${{ env.USER_TOKEN }}" --contrib-unique-data --contrib-openapi-formats-uuid --hypothesis-suppress-health-check=filter_too_much --stateful=links'
 
+      - name: Run Invitations API tests
+        if: steps.changes.outputs.invitations == 'true'
+        uses: schemathesis/action@v1
+        with:
+          schema: api/openapi/invitations.yml
+          base-url: ${{ env.INVITATIONS_URL }}
+          checks: all
+          report: false
+          args: '--header "Authorization: Bearer ${{ env.USER_TOKEN }}" --contrib-unique-data --contrib-openapi-formats-uuid --hypothesis-suppress-health-check=filter_too_much --stateful=links'
+
       - name: Stop containers
         if: always()
         run: make run down args="-v"
diff --git a/Makefile b/Makefile
index 6ef7655df..92364acda 100644
--- a/Makefile
+++ b/Makefile
@@ -159,6 +159,7 @@ endef
 
 test_api_users: TEST_API_URL := http://localhost:9002
 test_api_things: TEST_API_URL := http://localhost:9000
+test_api_invitations: TEST_API_URL := http://localhost:9020
 
 $(TEST_API):
 	$(call test_api_service,$(@),$(TEST_API_URL))
diff --git a/api/openapi/invitations.yml b/api/openapi/invitations.yml
index 768320445..5e23a8e09 100644
--- a/api/openapi/invitations.yml
+++ b/api/openapi/invitations.yml
@@ -29,6 +29,7 @@ tags:
 paths:
   /invitations:
     post:
+      operationId: sendInvitation
       tags:
         - Invitations
       summary: Send invitation
@@ -45,6 +46,8 @@ paths:
           description: Failed due to malformed JSON.
         "401":
           description: Missing or invalid access token provided.
+        "404":
+          description: A non-existent entity request.          
         "409":
           description: Failed due to using an existing identity.
         "415":
@@ -53,6 +56,7 @@ paths:
           $ref: "#/components/responses/ServiceError"
 
     get:
+      operationId: listInvitations
       tags:
         - Invitations
       summary: List invitations
@@ -89,6 +93,7 @@ paths:
 
   /invitations/accept:
     post:
+      operationId: acceptInvitation
       summary: Accept invitation
       description: |
         Current logged in user accepts invitation to join domain.
@@ -105,11 +110,14 @@ paths:
           description: Failed due to malformed query parameters.
         "401":
           description: Missing or invalid access token provided.
+        "404":
+          description: A non-existent entity request.          
         "500":
           $ref: "#/components/responses/ServiceError"
 
   /invitations/{user_id}/{domain_id}:
     get:
+      operationId: getInvitation
       summary: Retrieves a specific invitation
       description: |
         Retrieves a specific invitation that is identifier by the user ID and domain ID.
@@ -135,6 +143,7 @@ paths:
           $ref: "#/components/responses/ServiceError"
 
     delete:
+      operationId: deleteInvitation
       summary: Deletes a specific invitation
       description: |
         Deletes a specific invitation that is identifier by the user ID and domain ID.
@@ -452,6 +461,12 @@ components:
         application/json:
           schema:
             $ref: "#/components/schemas/Invitation"
+      links:
+        delete:
+          operationId: deleteInvitation
+          parameters:
+            user_id: $response.body#/user_id
+            domain_id: $response.body#/domain_id
 
     InvitationPageRes:
       description: Data retrieved.