Create Virtuemart payment module for paymentgateway.com

Payment module for virtuemart is needed to process credit card payments as bank I am using does not have a module already made. I have attached 3 files that I have received from the bank that should describe how their system works. I would prefer the module to be created in such a way that when the transaction of the customer is processing it says "connecting to www.mysite.com" rather than "connection to www.paymentgateway.com", in other words so the payment processor is hidden (and also cannot be ascertained by reading the source code). I would also prefer that the module be created in such a way that I can use it on other virtuemart sites that I create, easily. Possibly by changing options within a configuration tab for example with the payment moethod configuraiton on the virtuemart admin site. My bank has also provided a test account that can be used for testing purposes during the creation phase.