rocknbil - 5:26 pm on Sep 2, 2010 (gmt 0)
Just for discussion's sake, why would you think SIM has this advantage over AIM? (For those unaware, these are the two integration methods of the Authorize.net API - Simple/Advanced Integration Method.)
The transactions *still* occur at the gateway with AIM. You make the connection via silent post. No local CC info needs to be stored using AIM.