CCAVENUE INTEGRATED DIGITAL PRODUCT SITE

I need a script for selling downloadable digital products, payment should be through CCAVENUE and once payment goes through, the user should be presented with the download link (time limited link) and a serial number from a database of serial numbers. Each serial number should of course be used only once. In addition to this, the script will also email the customer with the download link and serial number. From admin panel the admin should be able to add new products, and for each product he should be able to upload a textfile with the serial numbers, and also add the title, description, images, and the links for the full version and links for trial version, etc. The front end main page should display the products , each product should have the image, title, price, buy now button, try free button (if a trial version link is included), and description. Everything should be responsive (should work well on all devices) If you cannot understand the above description please do not bother me with your broken English replies. If you understood all of the above, and you know how to communicate in English competently, and you know php and ccavenue inside out, then please bid on this project. This is not for newbies hoping to make a million dollars on freelancer, lol.. Max budget is $120. PLEASE DO NOT BID IF YOU DON'T KNOW WHAT CCAVENUE IS.