my question is regarding credit card no. validation. I want to accept payment by credit card on my web site. I have bank merchant account (also know about secure certificate). I'm not using any shopping cart program. I developed my own asp page to choose prdoucts and place your order. My question is how can I validate credit card number? Any other web site, accecpting credit card validate the card number and what are other necessary informations are require? Is shooping cart is must or asp page developed by me will work ? Please cover all points and guide me.