The cw2 on a credit card is the CONTROL NUMBER. It is a 3 digit number usually in the back of the card.
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One can find tips on credit card verification by a code on front or back of the credit card. The code acts as a security code and helps people know if the card is active or not.
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In terms of a credit card it means Card Verification code hence CVC.
The validation code is the last 3 digits on the back of the credit card in the signature strip. On American Express cards, the validation code is the 4 numbers that are on the front of the card.
On the back