GMS API method call returns HTTP code 200 OK on success or HTTP code 4xx/5xx on error:
|200||OK – Request was successfully processed|
|400||Bad Request – Your request is invalid. Please check request format and parameters.|
|401||Unauthorized – Your API key is wrong|
|403||Forbidden – Not enough rights to process the request due to GMS API firewall.|
|404||Not Found – The specified endpoint not found|
|50x||Internal Server Error – We had a problem with our server (might be 500, 502, 503 etc). Please try again later.|
HTTP error code gives generic information about error reason, but usually a JSON object is returned also with more details and API error code. Read more in API Errors section.