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Instant Payment Notifications (IPN) Meaning

The message service itself that provides real-time updates about transaction statuses. When a payment is made, refunded, or contested, the payment gateway sends an IPN message to the merchant’s server.

It is a fundamental tool for automating e-commerce and subscription billing. IPNs ensure that the merchant's internal records are always perfectly synced with the payment processor's records.

For example, if a customer cancels a recurring subscription at 3 AM, an IPN message will immediately inform the merchant's system to revoke the customer's access at the correct time. Because IPNs are sent asynchronously, they are highly reliable.

If the merchant’s server is temporarily down, most payment processors will continue to "retry" sending the IPN at set intervals until the merchant’s server acknowledges that the message has been successfully received.

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