The security code (CVV) is a three-digit number on the back of the credit card.
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Where Do I Find the CVV? Finding your CVV depends on the type of card you have. For Visa, Mastercard and Discover cards, you'll find the three-digit code on the back, usually inside or just above the signature strip. American Express does things differently, placing a four-digit CVV on the front, above the Amex logo.