What are those API status code (e.g. 200, 201, 400, 503)?
200: OK: We received the request: 201: Created: We received the request and created something. For example, we received a file upload request and a file is created. 204: No content: Incorrect locale used: 400: Bad request: Incorrect parameters (input data) 401: Unauthorized: Authentication error: invalid API key, miscalculated dev hash, etc ...