My PayPal IPN Server

My paid tweaks use a custom implementation of PayPal IPN for web payments.

PayPal is the most popular payment service on the web. Instant Payment Notification (IPN) is a message service that automatically notifies merchants of events related to PayPal transactions.

To build and set up my PayPal IPN intergration server I based my code on this and this tutorials, but highly customized it, to make it safe, fast, reliable.