These are HTTP callbacks (webhooks), sent from the Adyen server to the merchant server. They notify merchants about authorised, captured and modified payments, as well as other events.

Notifications (sometimes referred to as Instant Payment Notifications or IPN) are an essential part of the integration process with Adyen. They are used by merchants to ensure that they have processed all payment stages, and stored payment results in their database.

For more information, refer to Notifications.