Hi everyone. I've combed through the existing modules and can't seem to find what i'm looking for. Is there anyone who could give me some advice in modifying a payment module or an order total module that would enable a "free gift" selection? I want to offer a free gift to customers who make payments via bank transfer. Any ideas? Anything advice would be greatly appreciated.

I was also thinking about the ability to enable a popup window when a specific payment type is selected. That way I could notify the customers of the offering and they can just include their selection in the order notes. Thank you in advance again for the help.