PayPal Express Checkout - 2012 Guía de usuario descargar pdf (Pagina 59)

Express Checkout Integration Guide August 7, 2012 59

PayPal Name-Value Pair API Basics

Creating an NVP Request

Specifying an API Credential Using Signatures

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

use either a signature or a certificate, but not both.

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.

To enable PayPal to authenticate your request:

1. Specify the API username associated with your account.

USER=

API_username

2. Specify the password associated with the API user name.

PWD=

API_password

3. If you are using an API signature and not an API certificate, specify the API signature

associated with the API username.

SIGNATURE=

API_signature

4. Optionally, you can specify the email address on file with PayPal of the third-party

merchant on whose behalf you are calling the API operation.

SUBJECT=

merchantEmailAddress

NOTE: Typically, a merchant grants third-party permissions to a shopping cart. The merchant

previously must have given you permission to execute the API operation.

Specifying Credentials Using cURL

The following example shows one way to specify a signature using cURL:

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PayPal Express Checkout - 2012 Guía de usuario Pagina 59