X-Cart:Enabling Instant Payment Notification (IPN) in PayPal account
1. Login to your PayPal account.
2. Click Profile on the My Account tab.
3. Click Instant Payment Notification Preferences in the Selling Preferences column.
4. Click Edit IPN Settings to specify your listener’s URL and activate the listener.
5. Specify the URL for your listener in the Notification URL field. For example, if your X-Cart store is located at the address http://example.com/xcart/, you should specify your Notification URL as http://example.com/xcart/payment/ps_paypal.php.
6. Click Receive IPN messages (Enabled) to enable your listener.
7. Click Save.