Add a coupon code discount system to an existing E-Commerce site

I have an e-commerce site. It is actually a reseller site, the parent site being [login to view URL] . The site is provided by [login to view URL] itself which is completely brandable. Please find the reseller site below: <[login to view URL]> The reseller site does not have a coupon code system that provides discount for the customers on checkout. But I wish to have this coupon code system to give discounts to my customers on checkout. Through the coupon code system, I should be able to generate randomly generated coupons automatically and pass on to my customers. The coupons can be used only once and for only a particular product. As of now, everything on the site - billing, payment etc are handled by [login to view URL] on which I have a reseller account. If need be, I would give the login details to the winning bidder. You'll also be responsible for configuring the payment processor system. This could be done easily from the reseller account admin panel. There are options for that. You just have to follow the steps and install them. Also, you have to make a suitable logo for this site and insert it on the banner. This project is pretty simple for those who know what to do. Please take a look at the site before bidding. There are help documentations available for this project from [login to view URL] itself. You might want to have a look at them. <[login to view URL]> This project is very urgent and needs to be completed within the deadline. So please bid only if you are confident that you can handle the project. Thanks for looking!