
Web Services API Reference July 2006 21
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PayPal Web Services API
Architecture
The PayPal Web Services API provides programmatic access to PayPal features and services.
Developers can build custom applications, tools, and services that correspond to the same
services and tools available through the main PayPal website,
https://www.paypal.com/. Typical
applications include searching for transactions, paying en masse, and making refunds.The API
is based on open standards known collectively as “Web Services,” which include the Simple
Object Access Protocol (SOAP), Web Services Definition Language (WSDL), and the XML
Schema Definition language (XSD). These standards are supported by a wide range of
development tools on a variety of platforms.
Services Architecture
Like many web services, PayPal Web Services is a combination of client-side and server-side
schemas, hardware and software servers, and core services.
FIGURE 2.1 PayPal Web Services High-level Diagram
In an object-oriented processing model, the interface to SOAP requests/responses is an object
in your application’s native programming language. Your third-party SOAP client generates
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