Credit Card Functionality

Vishal,

What you need is a payment gateway and that is not too simple (but not too complicated either, or otherwise sites would be full of payment-related bugs). Point is to find a payment provider and then to get their source code for integration with them. Type Payment service providers on search engine and you'll get tons of resources to read.

Once you determine which payment provider you would like to integrate with, you would have to obtain their source code or libraries required to connect to their services. Major point regarding payments is that your website doesn't actually do any payment processing. You don't even create the form which accepts credit card details - that is all done by the payment provider's Web pages. Your job is to redirect to PP and to accept response from it, which would tell whether payment went well or not.

This method of deailng with payments protects both you and your customers. You don't have to go through huge and expensive work in getting security and other things right on your site. Customer on the other hand doesn't have to bother with questions did you protect his data (and especially credit card details) correctly and are you going to abuse them.

Most important issue is about credit card detials. Don't ever ask customers the credit card number and don't ever store that in database. If you do that, then you're becoming responsible for anything bad that could happen in the future. Let payment provider do that instead of you (and you're paying part of the revenue to them in order to do so).

Zoran