Credit Card Numbers: What Do They Mean?

You'll find your credit card number either on the front or on the back of the card. Credit cards usually have 15 or 16 ...
来自MSN

What Is a Card Verification Value (CVV) on a Credit Card?

The Card Verification Value (CVV) number is a unique code printed on your physical credit card used for card verification purposes. For most credit cards, this is a three-digit number printed on the ...