I have a website that's ready and done. It's designed for mobile and PC. The part which I require someone to do is: a Paypal Express Checkout with IPN notification that will work when the user make a transaction with his mobile, and not just a PC.
There is no need to develop any shopping cart.
If any server side coding is required, then it should be in PHP.
If any special Paypal account setup is required, or hosting setup, please specify it.
A live sample that works on mobile and normal PC will expedite everything.