Discover how credit card validation codes work and protect against fraud. Learn about their placement, security role, and examples to secure online transactions.

Credit card security codes are three-digit codes on the back of your card (four-digits on the front if you have an American Express card) used to verify that have the physical card. You typically ...

You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and instantly see a red error message ...