For Visa and MasterCard, the CSC code is located in the signature area at the back of the card. It is the last three digits AFTER the credit card number in the signature area of the card.

For Diners Club, the CSC or CVV code is located in the signature area at the back of the card. It is the last three digits AFTER the credit card number in the signature area of the card.

The CSC code for American Express is located in front of the credit card, right above the credit card number. This number can be either on the left or right side of the card.