These are the verification codes of the credit card known as Card Value Verification (CVV) or Card Verification Code (CVC). Both expressions mean the same, Visa uses the term CVV and Mastercard the term CVC. The verification code is an additional security feature that is required by oeticket when tickets are bought over the phone or the internet. This is to ensure that the person ordering has the card in his possession. The verification code can be found on the rear of the credit card as a small number in the signature field. The CVC / CVV code is the last group of digits (the last three digits ) in the series.