PayPal Merchant - 2005 Manual do Utilizador descarregar pdf (Página 103)

Merchant User Manual and Integration Guide May, 2005 103

Backend Integration - Payment Notifications

Instant Payment Notification (IPN)

PayPal’s Instant Payment Notification (IPN) allows you to integrate PayPal payments with

your website’s back-end operations. IPN provides immediate notification and confirmation of

PayPal payments you receive, allowing you to:

z Customize your website’s response to customer purchases in real-time.

z Track customers through the notification’s “pass through” variables.

z Automate your fulfillment operations.

z Store transaction information in your own database.

To activate Instant Payment Notification, you will need to go to your Profile to enter the URL

at which you would like to receive notification posts. Once you activate IPN, you will receive

an IPN when a payment is first sent which will state the status of the payment (Completed or

Pending). If the payment was “Pending,” you will receive another IPN when the payment

clears, fails, or is denied.

IPN can be seamlessly integrated with each of the PayPal Website Payments solutions (Buy

Now Buttons, PayPal Shopping Cart, Subscriptions and Recurring Payments, and Donations),

as well as with regular PayPal Send Money and Mass Pay payments, and lets you focus on

selling, not on manually tracking your orders.

How It Works

When a customer makes a payment to you or a payment is reversed or refunded, PayPal will

post a notification to your server at the URL you specified. Included in this notification will be

all of your customer’s payment information (e.g. customer name, payment amount) as well as

a piece of encrypted code. When your server receives a notification, it will then post the

information, including the encrypted code, back to a secure PayPal URL. PayPal will

authenticate the transaction and send confirmation of its validity back to your server.

After you have activated Instant Payment Notification, your server will be sent a notification

every time you receive a payment. This notification will be sent as a hidden “FORM POST” to

the URL you specified, and will include all of the payment information. The FORM variables

for these notifications are available in Appendix A of this manual.

NOTE: IPN will translate special characters into URL encoding format. For example, the

colon, ":", in http:// is translated to 3%A in the IPN post.

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PayPal Merchant - 2005 Manual do Utilizador Página 103