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What is Alipay asynchronous notification?

Alipay asynchronous notification is a method of sending payment results to the merchant server. In addition to the API response through the page redirect, the API response can also be sent to the partner in an asynchronous POST method. If the merchant sets the parameter "notify_url" in the request and specifies the target URL, then Alipay will send asynchronous notifications to the merchant. Alipay will automatically repeat up to 8 times to send asynchronous notification within 25 hours until the merchant server replies with "success" message in response. Generally, the interval for notifications are 4m, 10m, 15m, 1h, 2h, 6h, 15h. For more details of asynchronous notification, see Async Notification.

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