Hello,
I have installed local payment modules which are done by 3rd party coder. I think these modules doesnt handle gift vouchers as they should.

Example:
My order is 20e total. I use my 10e gv and get 10e final to pay. I select payment method go futher. When I'm about to pay the order at my bank I realize the order is total 20e.

So gvs doesnt redeem the total price when using these modules. Now I would like to try to fix this issue, but I cant find the files and code to work with. Can someone explain how it works. Thank a lot!