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Authorize.Net API

From their site: Since 1996, Authorize.Net has been a leading provider of Internet Protocol (IP) based payment gateway services, enabling merchants to authorize, settle and manage credit card and electronic check transactions from a Web site, retail store, mail order/telephone order (MOTO) call center or mobile device. With a live internet connection, developers can authorize and process payments through the Authorize.Net API, enabling the ability to emulate an HTML Form Post using a Secure Sockets Layer (SSL) connection.