PayPal Express Checkout - 2012 Guía de usuario descargar pdf (Pagina 33)

Express Checkout Integration Guide August 7, 2012 33

Getting Started With Express Checkout

Express Checkout Building Blocks

Express Checkout API Operations

The PayPal API provides three API operations for Express Checkout. These API operations

set up the transaction, obtain information about the buyer, and handle the payment and

completes the transaction.

Express Checkout Command

PayPal provides a command that you use when redirecting your buyer’s browser to PayPal.

This command enables your buyer to log in to PayPal to approve an Express Checkout

payment.

When you redirect your buyer’s browser to PayPal, you must specify the

_ExpressCheckout command for Express Checkout. You also specify the token that

identifies the transaction, which was returned by the SetExpressCheckout API operation.

NOTE: To enable PayPal to redirect back to your website, you must have already invoked the

SetExpressCheckout API operation, specifying URLs that PayPal uses to redirect

back to your site. PayPal redirects to the success URL when the buyer pays on PayPal;

otherwise, PayPal redirects to the cancel URL.

If the buyer approves the payment, PayPal redirects to the success URL with the following

information:

 The token that was included in the redirect to PayPal

 The buyer’s unique identifier (Payer ID)

If the buyer cancels, PayPal redirects to the cancel URL with the token that was included in the

redirect to PayPal.

API Operation Description

SetExpressCheckout Sets up the Express Checkout transaction. You can specify information

to customize the look and feel of the PayPal site and the information it

displays. You must include the following information:

 URL to the page on your website that PayPal redirects to after the

buyer logs into PayPal and approves the payment successfully.

 URL to the page on your website that PayPal redirects to if the buyer

cancels.

 Total amount of the order or your best estimate of the total. It should

be as accurate as possible.

GetExpressCheckout Obtains information about the buyer from PayPal, including shipping

information.

DoExpressCheckoutPayment Completes the Express Checkout transaction, including the actual total

amount of the order.

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PayPal Express Checkout - 2012 Guía de usuario Pagina 33