[Duramax 6.6L]

basically you will have to maintain a seperate domain with the x-payments module installed on it, xcart will handle the shopping functions, then send you to the x-payments module, the x-payments module will talk to the gateway that you choose to process the credit card info, then pass the approval or denial and the customer back to the original store site to finalize the transaction.

Looks like then end to one page check-outs

I do not see how this would be any safer that how xcart handles the credit card transactions now.