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.
2xx - OK
Everything worked as expected.
400 - Bad Request
The request was unacceptable, often due to missing a required parameter.
401 - Unauthorized
No valid API key provided.
402 - Payment required
The parameters were valid but the request failed. Usually due to invalid credit card details.
403 - Forbidden
You do not have the access to this resource
404 - Not Found
The requested resource doesn't exist.
409 - Conflict
5xx - Server Errors
Something went wrong on Xola's end. (These are rare.)