ssgumby - 5:37 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.
SIM, otherwise known as a boomerang payment gateway, removes PCI obligations from you and puts it on the payment provider.
When I was researching using a cloud environment, I was told by many the only way to do so was to use SIM or other boomerang providers. Using a boomerang would take away the PCI compliance as I would not be collecting or transmitting any personal info.