I have a snapshot of OSCommerce 2.2 dates about Dec 13, 2002. Recently the protocol at authorize.net for SIM has changed to require a transaction key. the new snapshots include a field in the admin for this key. Unfortunately, my snapshot does not. Rather than loading another snapshot, and losing all the mosifications and customization, is there a way to replace a few of the files that handle the authorize.net payment module? I have tried to download and install the contribution modules for the AIM method (Bao Nguyen), but it does not work. I am interested in using the standard module included with OSC using the SIM method. Can someone help?

Thanks!!

Mark