My client needs to be able to add discount coupon codes for products on his e-commerce site. He wants to be able through his cpanel to assign discount codes for particular products. He needs to be able to through his control panel add codes and attach discounts for each of the codes. He needs to be able to add the discount codes and remove them.
My client also wants to be able to display how much quantity of each product he has on his site. For instance if you are browsing his site and see a product you will be able to see how much he has in stock. After someone purchases one of those products it will immediately lower the number of that product inventory on the site. He needs to be able to enter product inventory amounts for each product through his cpanel.
He already has a control panel, shopping cart system already installed and working. He just needs those two functions added to his e-commerce site.