Responses

Xola uses conventional HTTP response codes to indicate the success or failure of an API request. In general, codes in the 2xx range indicate success, codes in the 4xx range indicate an error that failed given the information provided (e.g., a required parameter was omitted, a conflict occurred etc.), and codes in the 5xx range indicate an error with Xola's servers (these are rare).

Not all errors map cleanly onto HTTP response codes, however. When a request is valid but does not complete successfully (e.g., a card is declined), we return a 402 error code.