PHP Paypal IPN Integration Class

This file provides a neat and simple method to interface with paypal and the paypal Instant Payment Notification (IPN) interface. It is designed to be an aid, and therefore provide the developer with complete control. I've also included a demonstration file in the zip, called paypal.php, which shows how to use the class. This class handles the submission of an order to paypal aswell as the processing an Instant Payment Notification (IPN). Including the demonstration file, the entire "paypal system" consists of just 2 PHP scripts. Once is the class and one implements the class.