Below is an example of an Instant PayMent Notification (IPN) script which is freely available on the PayPal website. The script forms the basis of the IPN script used in our product MembersPro PayPal. PayPal also has a test environment called the PayPal Sandbox which provides you with an opportunity to run a test PayPal IPN script.
Check out our page for a more detailed explanation of how PayPal Instant Payment Notification (IPN) works.
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Plug and play ASP membership script that integrates with PayPal to let you charge recurring membership fees.