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. All you need to authorize and process payments through Authorize.Net is a live Internet connection and the ability to emulate an HTML Form Post using a Secure Sockets Layer (SSL) connection.

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Comments
at 06:43
I have been using free Oscommerce shopping cart with Authorize.net the last 5 years, which very easy to setup. It is only $7 at www.unitedbankservice.com if anyone is looking for an inexpensive solution.
at 00:46
the authorize.net API is quite simple to use. We at menexis have been utilizing their platform for years now. They also have a great support system
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