CVV Code

I have a website that utlizes the oscommerce. I have the credit card module installed but it does not ask for the CVV security code in order for us to process the customers credit card with our virtual terminal. I need the proper files fixed to ask for the cvv security code on checkout and stored in the database for the customers order. I'm utilizing 2 oscommerce on my website for 2 different brands of clothing I'm selling therefore I'll need the fixe for both oscommerce databases and files.