Help on Coupon Bugs

Hi. I am using opencart 1.5.1

It's a custom install and is already modified. But we are stuck in fixing the coupon history bug.

We created a new payment gateway but tailored it with the paypal structure and it does not seem to record the coupon history when a coupon is used.

We tested using OC's bank transfer payment and the coupon history records successfully.

We compared code and we found nothing new with the bank transfer payment method, most of the commands on the file for bank transfer are also in our files which does not work.

I am really having trouble with this and is seeking for professional help.

If there is anyone that can direct me which files to change - I can do that. Also am willing to pay for the person who can fix this for me.

I hope someone responds fast.

Thank you.

Takers anyone? Comments or any help at all?

Has anyone really has resolved this? I hope a good samaritan comes along that has the solution that would offer their services.