I have a heavily modded OSC cart with a checkout problem, specifically with the gift voucher contribution.
Users with a voucher balance are redirected directly to the payment success page where they access an instant download. This happens even if they do not check the box to use the voucher. Furthermore, no voucher deduction is made.
The basic problem is that users who do not check the gift voucher box should be directed to Paypal to complete payment but, instead they simply pass right through to get the download as long as they have enough voucher balance to cover the purchase.
All works well if the gift voucher box is checked.
This cart has other mods so I had to add the GV contrib piece by piece and may have just missed something.
Since this is a small fix I'd like it done on our server. I'll deposit payment in escrow and release when finished.