public class PayPalExpressSetAction
Action class to handle a request from the user to use PayPal Express to
checkout. Corresponds to the url "/PayPalExpressSet.do".
As required by PayPal, users can choose to use PayPal Express in two
locations: on the cart screen, and on the checkout payment screen. In either
case, this action is executed, which triggers the first of the three API
calls the PayPal Express: SetExpressCheckout.
The execute method of this class invokes
or whatever class is defined in the "activePaymentProcessors" setting that
corresponds to the paypalExpressForm.jsp template, to communicate with