IPN is a message service that sends you a notification when any type of transaction occurs in your account. The messages are received and processed by your server(s).
To receive and process Instant Payment Notification (IPN) messages:
- Create an IPN listener to receive and process the IPN messages sent by PayPal. For complete details on creating an IPN listener, see Implementing an IPN Listener.
- In your PayPal merchant account settings, enable the IPN Message Service and specify the URL of your listener.
- Continuously run the IPN listener on the website specified by your listener URL.