PayPal Express Checkout - 2009 Guide de l'utilisateur télécharger pdf (Page 31)

Express Checkout Integration Guide October 2009 31

PayPal Name-Value Pair API Basics

Creating an NVP Request

A method specifies the PayPal operation you want to execute. Each method is associated with

a version number; together, the method and version defines the exact behavior of the API

operation. Typically, the behavior of an API operation does not change between versions;

however, you should carefully retest your code whenever you change a version.

To specify a method and version number

1. Choose the PayPal API operation you want to use.

METHOD=

operation

2. Choose the appropriate version.

In most cases, you will want to use the latest version of the API operation.

VERSION=

version_number

Setting the API operation and version using PHP

function PPHttpPost($methodName_, $nvpStr_) {

...

$version = urlencode('52.0'); // NVPRequest for submitting to server

$nvpreq ="METHOD=$methodName_&VERSION=$version...$nvpStr_";

...

}

Specifying an API Credential

You must specify API credentials in each request to execute a PayPal API operation.

When you execute a PayPal API operation, you use credentials, such as a signature, to

authenticate that you are requesting the API operation. The following diagram shows the API

credentials part of an NVP request:

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PayPal Express Checkout - 2009 Guide de l'utilisateur Page 31