I'm developing a web application, using ASP.net and C# need to provide a functionality through which users can pay through their cards (Credit card, Master card, Visa card, Debit card etc.) how do i process a transaction, means that when user enter payment details and click on pay button, how do i verify that these payment details are valid and money is transferred to merchant account. I never handle payments before, so where do i start with?

How to process payments through cards?

I'm developing a web application, using ASP.net and C#

need to provide a functionality through which users can pay through their cards (Credit card, Master card, Visa card, Debit card etc.)
how do i process a transaction, means that when user enter payment details and click on pay button,
how do i verify that these payment details are valid and money is transferred to merchant account.

I never handle payments before, so where do i start with?