Because E-junkie is a centrally-managed service that is pre-integrated with Authorize.Net, the card-based checkout page must be on our server and for security purposes cannot be customized.
This is one of the inherent tradeoffs in using a shared service like ours that's already fully operational on our server and pre-integrated with the various payment services we support. Although you do lose some flexibility and customizability, you are spared the considerable trouble of having to install and configure a free-standing eCommerce software package from scratch on your own server and integrate that software with Authorize.Net (and/or other payment processors) on the backend manually yourself.
