ASP Website needs credit card payment integration

I have a website where users can register for a service that I am providing. I want to be able to have users subscribe and pay before they are added to the database. The way I want to implement this is that I want the user to input their information that we will need for the subscription service, then they can be taken to the Merchant account provider (LinkPoint) and pay from that website and have their information added to the subscription database after the payment has gone thru. Nothing fancy, just like you would subscribe to any website that you would have to pay for. First you fill in your information (I have this page already fully functional) then you pay and in the end you get a confirmation page that lets you know that you have subscribed and your payment went thru. But if the payment has not gone thru then I want the user to be brought back to the page where they enter their credit card info, so they can enter it in again. In addition if the payment did not go thru then the subscription information will not have been put into the database. All information about the account will be confidential and cannot be used for any other reason other than my own or without my written consent. I only say this for legal purposes. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform ASP website running on a virtual windows 2003 server MS SQL database