You may still find that when shopping on the Internet you just have to give your credit card number and the three-digit number on the back. You may still find that when shopping on the Internet you just have to give your credit card number and the three-digit number on the back.
This is the verification code which tends to prove that you are in possession of the means of payment, and thus prevent a hacker in possession of the card number alone from being able to use it for fraudulent purposes.
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