Is there something somewhere, PDF or help file to offer instructions as to how different payment gateways may be added to the software? Or for that matter, can additional gateways be added to the software at all?

The only payment gateways that are supported are already included with the software. You can choose from PayPal, 2Checkout, WorldPay, Authorize.net and Google Checkout.

So there's no plan in the future to add more payment modules for additional gateways like ZenCart or other older shopping carts? Might be something to consider as a selling point, add on modules, go figure!

Right now there are no plans to include any more, or at least for the foreseeable future. PayPal is just the worlds leader in online transactions and they are growing more and more each day. Sooner or later everyone will just have to embrace them.

Sooner or later everyone will just have to embrace them.

Guess what Scott 30 years experience in retail tells me everyone won't (generally in UK refereed to as PayPoo)

I know what you mean though but i have hundreds of customers who refuse point blank to use them, hence i have added direct bank transfer option to my cart page.

Trouble is most that refuse to use Paypal will never embrace paying on line anyway, so they need to go back to the high street and stop wasting our (internet sellers) time !