Your security code is a 3- or 4-digit number on your credit card. If your code is illegible, call your credit card company.
Find your 3-digit security code on the back of your card, above the signature panel. It's the last three digits following your credit card number, as pictured below.
Your security code is the 4-digit code printed right above your credit card number on the front of your card, as pictured below.