Basic eCommerce (.NET) feature integration( HTML & CMS is already done )

We already have the website made in ASP.NET. Design for all pages are already there. We will provide all the designs if required for any inner pages. We want to sell the products too from the website, so you have to make a very basic shopping cart and ecommerce features as per the following - 1. User Registration & Login ( activation through email validation link + by twitter, facebook connect ) & user dashboard ( users can track their orders, change profile info-password, create support ticket ) 2. Product table is already there in the CMS, you need to track the orders only, which will be stored in the backend too. 3. Payment Gateway will be Paypal & CCAvenue 4. Admin can change content & design of Emailers from backend ( Successful Registration , Order , Cancel , Order Status ) 5. Mobile version is stored in separate folder "[login to view URL]" which is using the same database. So you have to make amendment to this version also. This is the website - [login to view URL] Order History Page : [login to view URL]