How To Implement an Instant Payment Notification listener script in PHP - PayPal IPN with PHP

Using PayPal's Instant Payment Notification (IPN) service can be a little complex and difficult to troubleshoot to developers new to PayPal. In this post I will walk you through the entire process using the PHP-PayPal-IPN project to avoid many of the common pitfalls in the back-end PHP code. Visit following link:

http://www.micahcarrick.com/paypal-ipn-with-php.html