Free Digital Downloads with Coupons

We are going to realize a new project for Free Digital Downloads with Coupons from our web site through random digital codes. Our idea: we need php or any other application which to be added to the php node on our Drupal web site, in order the client when they go to the specific page for example [login to view URL] , the application or script should be open together with the node. How work the system: 1. We can generate for example 500 random codes in file and to print them and put it in the product, in our case this cd box. 2. When the client buy the cds and open it he should go on the link [login to view URL] add in the field our random code, add his e-mail address in the second field and to get by e-mail, the generated link with the zip file, in able to download it from our server. 3. The links should expired after 3 days after arisen. After that to redirect to any other page 4. Securitization of the application in order to avoid any hacks. This is the most simple explanation what and how to work. Admin panel of the project: 1. We need to be able to generate different campaigns and every campaign should have specific zip files for download 2. The clients emails belongs to generated codes should be added in a statistic table, so we can separate which e-mails for which campaigns belongs 3. Statistic – we need some simple statistic daily/weekly/monthly/ e-mails are added/ how may downloads are made per different campaigns 4. Selecting the country of the user 5. Filters by campaigns, / by countries/the whole base or by dates System requirements: 1. our server is Linux based – Debian 64 bit, 2. to use as low as possible resources – our server is 2 GB RAM 2 CORES, SSD server provided of [login to view URL]