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Instant Payment Notification (IPN) is a notification mechanism that uses HTTP POST to send you immediate updates on transactions. IPN saves you the trouble of polling Amazon FPS for transaction results that complete asynchronously.
Amazon FPS sends you an IPN whenever a transaction completes, specifically when:
Funding a prepaid instrument succeeds
Funding a prepaid instrument fails
Funding a prepaid instrument goes into a pending state
Settling a debt succeeds
Settling a debt fails
Settling a debt goes into a pending state
A prepaid or postpaid Pay call following a purchase on your website succeeds
A prepaid or postpaid Pay call following a purchase on your website fails
A refund goes into a pending state
A refund succeeds
A refund fails
A token is canceled successfully
You must configure IPN for it to operate. If you don't configure IPN, email is the only notification.
For information on configuring IPN, see Setting Up Instant Payment Notification.