PayPal Instant Payment Notification - 2009 Podręcznik Użytkownika Pobierz pdf (Strona 17)

IPN Guide June, 2009 17

Introducing IPN

Non-IPN Notification Mechanisms

PayPal will then send one single-word message, VERIFIED, if the message is valid; otherwise,

it will send another single-word message, INVALID.

IMPORTANT: After you receive the VERIFIED message, there are several important checks

you must perform before you can assume that the message is legitimate and

not already processed:

Confirm that the payment status is Completed.

Use the transaction ID to verify that the transaction has not already been

processed, which prevents duplicate transactions from being processed.

Validate that the receiver’s email address is registered to you.

Verify that the price, item description, and so on, match the transaction on

your website.

Non-IPN Notification Mechanisms

You can use IPN with other notification mechanisms. For example, you can use PDT or the

API to determine real-time information about a transaction and let IPN notify you of any

changes after the transaction occurs.

If you are using Website Payments Standard, you can use PDT to obtain information about the

transaction. If you are using Express Checkout or Direct Payment, the PayPal API notifies you

of the status and details of the transaction immediately and automatically. In either case, you

can immediately display to your customer the information being returned from PayPal. You

should not use IPN for this purpose.

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PayPal Instant Payment Notification - 2009 Podręcznik Użytkownika Strona 17