If an error occurred, a description of the type of error.

If the XML-RPC interface returned an error, the error code will be here.

The array of return parameters provided by with the XML-RPC response. Contents of this array will vary with the XML-RPC API being used.

The HTTP status code (like 200, 301, etc.) returned. This will be 200 if communication with the XML-RPC endpoint was successful, even if a fault occurred processing the request. Be sure to use the success property and faultCode to check for errors.

whether the request was completed successfully. This value will be true if both the HTTP status code is 200 and no fault code was returned from the API.