The security code may be located on the front or back of your card.
Visa, MasterCard, Discover, China UnionPay, JCB, and Diners Club
Check the back of your card for a three-digit code that's after your card number:
Check the front of your card for a four-digit code that's above your card number:
If you security code is missing or unreadable, contact your bank or credit card issuer for help.