Since there is a lot of talk/question about our Authorize.net DPM module for 4.5.x in this thread, we do have it available for this version since late May and have many utilizing it already. It does
not require Authorize.net AIM. It was just convenient before to use the AIM settings in the DPM module for previous versions of X-cart.
http://www.bcsengineering.com/store/authorize.net-dpm-module-for-x-cart-pa-dss-compliant.html?MMCF_xfDPM45x
Carrie