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 ...

When you make credit card purchases online or over the phone, you'll often need the card's security code to complete the transaction. The security code helps to protect you from credit card fraud and ...

Whether shopping online or over the phone, you must provide your credit card information to process the transaction. Apart from entering a card number and an expiration date, you probably will have to ...

If you're trying to log into Facebook and it's not sending a security code, check your spam folder or request the code to be delivered another way. You should also try restarting the app and your ...