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The card verification value is an important security feature for credit card transactions on the internet.
MasterCard, Visa and Discover credit cards have a 3 digit code printed on the back of the card while American Express cards have a 4 digit code printed on the front side of the card above the card number.
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![](/paulk_homes/img/cvv2_example_1.gif) |
![](/paulk_homes/img/cvv2_example_2.gif) |
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