Credit Card Security

[Guest]

I have a brick and mortar store. My Oscommerce store is ready to gp - one question - pn payment modules. I have Paypal enabled - but I want to enable credit card as well and I can run at my store - but I can find an addon contribution to add abox for the security code? Can someone direct me, or if i dont need an add on, tell me how to enable it, i dont see it - Thanks