AddCustomField Method
This adds a custom name-value pair to be sent with the next request.
Syntax
int AddCustomField(const QString& qsName, const QString& qsValue);
Remarks
This method should be used to append a custom name-value pair to the next outgoing request to PayPal.
Note: The custom fields that have been added will be cleared by the class automatically after each request.
Error Handling
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)