You'll find the credit card verification numbers in the following places:..
Visa & Mastercard
Look for a three-digit, non-embossed number printed on the signature panel on the back of your card.
Look for a three-digit, non-embossed number printed on the signature panel on the back of your card.
American Express
Look for a four-digit, non-embossed number printed above your account number on the front of your card.
Look for a four-digit, non-embossed number printed above your account number on the front of your card.