The CVV number is the three-digit combination on the back of your credit card, used to protect your finances from fraud and theft. It is 3 digits for MasterCard and Visa, while it is a four-digit number for American Express cards. The CVV is an anti-fraud measure implemented by credit card companies...
6. The CVV represents the card verification value on the back of the card, made up of three digits, needed for payment, so be careful to hide this code. 2. Why can we generate a valid credit card number? When we know the rules of a credit card, then anyone can generate a credit card number.