NOISSUE - Reject invitations (#2379)

Signed-off-by: Sammy Oina <sammyoina@gmail.com>

api/openapi/invitations.yml

@@ -104,7 +104,7 @@ paths:
       requestBody:
         $ref: "#/components/requestBodies/AcceptInvitationReq"
       responses:
-        "200":
+        "204":
           description: Invitation accepted.
         "400":
           description: Failed due to malformed query parameters.
@@ -115,6 +115,30 @@ paths:
         "500":
           $ref: "#/components/responses/ServiceError"
 
+  /invitations/reject:
+    post:
+      operationId: rejectInvitation
+      summary: Reject invitation
+      description: |
+        Current logged in user rejects invitation to join domain.
+      tags:
+        - Invitations
+      security:
+        - bearerAuth: []
+      requestBody:
+        $ref: "#/components/requestBodies/AcceptInvitationReq"
+      responses:
+        "204":
+          description: Invitation rejected.
+        "400":
+          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