I attempted to use this today to see if it works and it didn't seem to. Where do you edit to see what the software passes along to authorize.net? Main error was it wasn't passing along a description of the transaction but i'd look to see what it's sending.\
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Thanks\
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utahonlineauctions
To process Authorize.net you must enable the Secure server and your certificate must be valid, it will not accept none SSL connections. Then after that all you need to do is put your login in the admin>billing manager->merchant account setup.