The Card Security Value (CSV) number is printed directly on your credit card. Depending on the type of credit card you have, the number will be in one of the locations pictured below:
Visa, MasterCard or Discover: The CSV number is on the back of your card. It is the last three digits that appear after your 16-digit credit card number in the signature panel.
American Express: The CSV number is on the front of your card. It is the four digit number that appears on the right side, above your imprinted 15-digit credit card number.