To ensure that the security of your credit card is fully protected, our website requires you to enter the CVV Number, the 3-4 digit security code on VISA, MasterCard, and American Express credit cards.
Since merchants are not allowed to possess this information, you are required to enter it only once, when you register your credit in your CDJapan Customer Account. Registration of your credit card will be completed once the CVV code is verified.

Visa & MasterCard The 3-digit number is located on the back of your credit card.

American Express The 4-digit number is located on the front side of your credit card. American Express calls the number CID.