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Authorize.net PHP class
=ADC - Direct Response Method Support
=AIM - Advanced Intergration Support
=Libcurl for ssl supported (and required)
=MD5 connection crosschecking
=CVV2 card code processing
=Address verification support
=Zend encoded for speed and license security
=Easy to use PHP class wrapper
URL: http://www.kevin-mcarthur.com/
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Cost: N/A Platforms: N/A Version: 5.1