Dansie / ZenCart authorizenet Help

Trying to wrap up a PHP project, and am stumped by some not very PHP issues... I need some help with the following scenario: Dansie shopping cart (Perl) is in use, and must remain active until other "stores" can be re-coded. ZenCart is installed, and ready to roll, except... Setting in authorizenet control panel are making it not work. Using a fresh new dev account can test/production ZC transactions fine. I'm trying to use authorizenet_aim module. Dansie is definitely not using _aim. Talking to authorizenet has been a brick wall so far. So somebody who REALLY understands authorizenet and all their control panel things that make no sense to me is needed. The client has signed a rather large contract that stepped up development pace from "whenever" to "yesterday"... The carrot: Much future PHP work may be available with this client, as I'm way too busy to do things at their pace/needs. Rates negotiable. Please reply off-list, of course. -- Some people have a "gift" link here. Know what I want? I want you to buy a CD from some starving artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So?