Request and response model

Every response is a JSON envelope: status (SUCCESS or ERROR), status_code (the HTTP status, repeated in the body), message (human-readable, never echoes your input), code (a stable machine-readable string — branch on code, not on message), request_id (equal to the x-amzn-RequestId response header; quote it to support) and, on success, result. Optional fields may be null; a field the response does not have is omitted.