What is my CVV code?
Visa and Master card cardholder: turn your card over and look at the signature box. You should see either the entire 16-digit credit card number or just the last 4 digits followed by a special 3-digits code. This 3-digits code is your CVV number.
American Express card holders: look for 4-digit code printed on the front of your card just above and to the right of your main credit card number. This 4-digit code is your CID (Card Identification number)
More info on https://www.cvvnumber.com