The Instant Payment Notification (IPN) system notifies your server when a payment is received or when the payment status changes. This is a simple yet powerful way to integrate CoinPayments into your software, allowing you to automate processes such as order fulfillment, digital product delivery, accounting, and more.
The IPN is implemented via an HTTP POST request sent to a script or CGI program hosted on your server, using either an https:// or http:// URL.
For complete implementation details and additional information, please visit:
https://www.coinpayments.net/merchant-tools-ipn