Why did I get API error code 10600?
PayPal returned API error code 10600 - Authorization voided.
The authorization you're trying to perform on a DoAuthorization, DoCapture, DoReauthorization, DoVoid or UpdateAuthorization has already been voided and can't be used because it's no longer valid.
Close the order or authorization.
DoAuthorization API Operation (NVP)
DoAuthorization API Operation (SOAP)