PayPal Merchant - 2005 Manual do Utilizador descarregar pdf (Página 105)

Merchant User Manual and Integration Guide May, 2005 105

Backend Integration - Payment Notifications

Instant Payment Notification (IPN)

so you can be sure the IPN came from PayPal. Upon verification, PayPal will send your server

a “VERIFIED” or “INVALID” response.

Step 5: When you receive a VERIFIED response, you need to perform several checks before

fulfilling the order.

NOTE: An INVALID response could be due to inaccurate or incomplete IPN data being

posted back to PayPal. However, an INVALID response should be treated as

suspicious, and should be investigated.

z Confirm that the payment status is Completed, since IPNs are also sent for status types

such as Pending or Failed.

z Check that the transaction ID is not a duplicate — this prevents a fraudster from using an

old, completed transaction.

z Validate that the receiver_email is truly your account — this prevents the payment

from being sent to a fraudster’s account.

z Check other transaction details, such as item number and price, to confirm that the price

hasn’t been changed.

Step 6: After successfully completing the checks, you can update your database with the IPN

data and process the purchase.

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PayPal Merchant - 2005 Manual do Utilizador Página 105