Registration form to integrate with Payment Gateway

We have a registration form with various pricing for user to pay online. 1) We need a programmer to do auto calculationg for the registration form and integrate with our payment gateway provider. 2) A simple shopping cart is needed (if necessary) , 3) need to capture registration data into a excel file for admin to download. 4) and integrate with shopping cart with passback parameter for confirmation. 5) Email all parties on the successful payment. The registration form & API for payment gateways is ready to send to bidder for quote & reference. Database to store the registration info: Ms Access Programming : ASP To Start: immediately. Thanks, YK