Visa/Mastercard and Discover
On the back of your card you will find (either the entire 16-digit string of your card number, OR just the last 4 digits), followed by a space, then followed by a 3-digit number. The 3-digit number is your security code.


American Express
The 4-digit security code is printed above and to the right of the imprinted card number on the front of the card.
