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What is the Card Code?

There is a set of extra three or four digits that is printed on credit cards for the card security and verification. The digits appears in reverse italic at the most right hand side in the signature panel on the back of the credit card,  following the credit card number or the last 4 digits of the credit card number. 

Here is the location of the Visa or MasterCard card code:


Here is the location of the Discover card code:

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