Create a coupon code script for my website

Website is design in core PHP: Coupon code module Backend: 1. Admin can add coupon with coupon code, coupon category, coupon sub category 2. Admin Can also select Multiple products at once- or Select all of them 3. Admin can select coupon type a. Like: onetime, lifetime and fix time coupon b. In one time, coupon will expired same moment the person use it c. In Life time, coupon will never expired until admin delete d. In fix time, coupon will set date to be expired. 4. Admin can add coupon amount. a. Percentage b. Fix Amount 5. Admin can delete coupon. Front End: 1. The user can choose to delete the coupon after it apply. a. In this module we give user to delete link. When user click on it coupon will delete n display product with original price. 2. Coupon Will appear also in cart the coupon apply 3. Coupon will be display on all pages for all product conditions 4. When user add coupon. a. Display the amount of coupon. b. Display new product price. c. Example : 1. Product Price : $62 2. Coupon: $ 4 3. Product New Price: $66 5. Make sure after the coupon does not save in front end forever after the person apply it. The person does not need to delete cookies for it to disappear. Coupon will appear in all pages after it show the price we offer for the product