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PayPal Name-Value Pair API Basics

PayPal API Client-Server Architecture

16 August 2012 Name-Value Pair API Developer Guide

PayPal Name-Value Pair API Requests and Responses

To perform a PayPal NVP API operation, you send an NVP-formatted request to a PayPal

NVP server and interpret the response.

In the following diagram, your website generates a request. The request is executed on a

PayPal server and the response is returned to your site.

The request identifies:

 The name of the API operation, specified by METHOD=name, to be performed and its

version

NOTE: After the METHOD parameter, you can specify the parameters in any order.

 Credentials that identify the PayPal account making the request

 Request-specific information that controls the API operation to be performed

A PayPal API server performs the operation and returns a response. The response contains:

 An acknowledgement status that indicates whether the operation was a success or failure

and whether any warning messages were returned

 Information that can be used by PayPal to track execution of the API operation

 Response-specific information required to fulfill the request

UTF-8 Character Encoding

The PayPal API assumes that all data in requests is in Unicode, specifically, the Unicode (or

UCS) Transformation Format, 8-bit encoding form (UTF-8).

In responses, the API always returns data in UTF-8.

Multiple API Operations

Some of the features, such as Express Checkout, require you to call multiple API operations.

Typically, these features require you to:

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