Callbacks service docs updated

interface/api/callbacks/response/callback.yaml

@@ -1,6 +1,7 @@
 components:
   schemas:
     CallbacksAuthData:
+      description: Authenticated response payload containing callback configurations.
       type: object
       additionalProperties: false
       required:
@@ -8,12 +9,14 @@ components:
         - callbacks
       properties:
         accessToken:
+          description: Refreshed access token to be used in subsequent API calls.
           $ref: ../../../models/auth/token_data.yaml#/components/schemas/TokenData
         callbacks:
+          description: Collection of callbacks configured for the authenticated scope.
           type: array
           items:
             $ref: ../../../models/callback/callback.yaml#/components/schemas/Callback
         generatedSigningSecret:
+          description: Newly generated signing secret when secret rotation is requested.
           type: string
           nullable: true
-