PayPal Adaptive Payments - 2012 Betriebsanweisung PDF herunterladen (Seite 257)

Adaptive Payments Developer Guide August 7, 2012 257

Instant Payment Notifications

PayPal sends an IPN message in response to a payment, a refund, creation of a preapproval,

and cancellation of a preapproval. Your IPN message handler must be set up in the way

described in the Instant Payment Notification Guide.

Specifically, it must guard against spoofing and it must be able to handle duplicate messages,

which can occur, for example, if your application is both the caller of the Pay API and a

receiver of the payment.

The IPN messages listed here do not use the IPN message handler that you can specify in the

Profile. IPN messages are only sent to the notification URL specified in the Adaptive Payment

API operation’s request.

IMPORTANT: IPN variable names, such as transaction[0].status are strings and you

must manipulate them as strings. Some languages, such as PHP and others,

may attempt to interpret the non-alphanumeric characters found in the

variable name. To avoid misinterpretation of these strings, you should always

to use the raw HTTP request string and process it yourself rather than rely on

the support provided by the language to obtain request parameters.

Pay Message Variables

PayPal generates an IPN message that contains information about the pay request or payment

in response to the Adaptive Payments Pay and ExecutePayment API operations.

Variable Description

transaction_type The type of transaction. Possible values are:

 Adaptive Payment PAY

This notification occurs when is a payment is made due to a PayRequest.

The variables for the Adaptive Payment Pay notification are similar to

the PaymentDetailsResponse fields.

 Adjustment

This can be for a chargeback, reversal, or refund; check the reason_code

to see which it is.

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PayPal Adaptive Payments - 2012 Betriebsanweisung Seite 257