Coupon and Ticketing/Payment System

I need a ticketing and payment system done for a e book website. The ticketing system should be such that people will buy coupons that will enable them to read one book or 5 books and 10 books or so according to that specific coupon. But not any book, for a particular coupon code it will be a particular book or a particular set of books which will be set by the admin. So it involves generating coupon codes and attaching a book or multiple books to that coupon code. I will explain the finer details once you bid for it. Thanks ****NOTE*** While bidding please type in the words "EBook Project" so that I can know that you have gone through the requirement and have not simply bidded for it.