feat: Update swagger to openapi 3.0.4, update request payloads with examples (#11374)

swagger/paths/application/custom_attributes/show.yml

@@ -2,20 +2,33 @@ tags:
   - Custom Attributes
 operationId: get-details-of-a-single-custom-attribute
 summary: Get a custom attribute details
+security:
+  - userApiKey: []
 description: Get the details of a custom attribute in the account
 parameters:
-  - $ref: '#/parameters/account_id'
+  - $ref: '#/components/parameters/account_id'
   - in: path
     name: id
-    type: integer
+    schema:
+      type: integer
     required: true
     description: The ID of the custom attribute to be updated.
 responses:
-  200:
+  '200':
     description: Success
-    schema:
-      $ref: '#/definitions/custom_attribute'
-  401:
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/custom_attribute'
+  '401':
     description: Unauthorized
-  404:
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'
+  '404':
     description: The given attribute ID does not exist in the account
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'