2Checkout sends the first Instant Payment Notification (IPN) instantaneously for events per your account’s Notification Settings.
If the initial notification fails, the subsequent two (2) IPN messages are sent after the next five (5) minutes.
If the issue persists, and requests continue to result in failures, 2Checkout makes another four (4) retries, 15 minutes apart.
Following the four tries made in Stage 3, the 2Checkout system performs one-hour interval continuous requests for a maximum of two (2) days after it sent out the initial notification, until a valid response.
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