PayPal Pro - 2012 Guía de usuario descargar pdf (Pagina 81)

PayPal Payments Pro Integration Guide April 2012 81

Getting Started With the PayPal Name-Value Pair API

Creating an NVP Request

A method specifies the PayPal operation you want to execute, and each method is associated

with a version. Together, the method and version define 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 should use the latest version of the API operation.

VERSION=

version_number

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:

IMPORTANT: You must protect the values for USER, PWD, and SIGNATURE in your

implementation. Consider storing these values in a secure location other than

your web server document root and setting the file permissions so that only

the system user that executes your ecommerce application can access it.

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PayPal Pro - 2012 Guía de usuario Pagina 81