Integration Guide
Table Of Contents
- PayPal Express Checkout Integration Guide
- Contents
- Preface
- Getting Started With Express Checkout
- Express Checkout User Interface Requirements
- Related API Operations
- Integrating Express Checkout With PayPal SDKs
- Going Live With Your Express Checkout Integration
- Obtaining API Credentials
- PayPal Name-Value Pair API Basics
- PayPal SOAP API Basics
- PayPal WSDL/XSD Schema Definitions
- PayPal SOAP API Definitions
- Security
- SOAP RequesterCredentials: Username, Password, Signature, and Subject
- SOAP Service Endpoints
- SOAP Request Envelope
- Request Structure
- SOAP Message Style: doc-literal
- Response Structure
- Error Responses
- CorrelationID for Reporting Problems to PayPal
- UTF-8 Character Encoding
- Date/Time Formats
- Core Currency Amount Data Type
Express Checkout Integration Guide August 7, 2012 57
PayPal Name-Value Pair API Basics
NVP Format
1. Invoke an API operation, such as SetExpressCheckout, that sets up the return URL to
which PayPal redirects your buyer’s browser after the buyer finishes on PayPal. Other
setup actions also can be performed by this API operation.
2. Invoke additional API operations after receiving the buyer’s permission on PayPal, for
example, GetExpressCheckoutDetails or DoExpressCheckoutPayment.
The following diagram shows the execution flow between your site and PayPal:
Token Usage
Typically, the API operation that sets up a redirection to PayPal returns a token. This token is
passed as a parameter in the redirect to PayPal. The token also might be required in related
API operations.
NVP Format
NVP is a way of specifying names and values in a string. NVP is the informal name for the
query in the URI specification. The NVP string is appended to the URL.
An NVP string conforms to the following guidelines:
The name is separated from the value by an equal sign (=). For example:
FIRSTNAME=Robert