A Single DLL ASP.NET Control will do everything for you if you want to develop an e-commerce web application with PayPal Website Payments Standard. Strong OOP Interface for PayPal Buy Now, Donation, Shopping Cart, Subscription, IPN & PDT. Enhanced Design Time GUI. Generates Encrypted Website Payment Buttons on the fly. IPN & PDT is considered as server side events where all IPN & PDT variables are available as Event Argument Class properties.