Integration Guide

Table Of Contents
Immediate Payment
Overview of Immediate Payment
8
82 October 2009 Express Checkout Integration Guide
From left to right, the following events are represented. The numbered callouts in the figure
directly correspond to the numbered comments below:
1. The eBay flow for third-party checkout redirects the buyer from an eBay payment review
page to your shopping cart page. On your shopping cart page, the buyer initiates Express
Checkout by clicking the Checkout with PayPal button.
2. In the call to the SetExpressCheckout API operation, you must pass the following
Immediate Payment information:
ALLOWEDPAYMENTMETHOD: This is the payment method type. For immediate payment,
the value is InstantPaymentOnly.
BUYERUSERNAME: EBay provides you with this value.
L_EBAYITEMCARTIDn: EBay provides you with this value.
Additionally, in the call to the SetExpressCheckout API operation, you must pass the
following Express Checkout API parameter data:
CHANNELTYPE: The value of the channel type, which is eBayItem .
L_EBAYITEMNUMBERn: This is the eBay item number.