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The value of this system of security may be disputed. |
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* [[American Express]] cards have a 4 digit code printed on the front side of the card above the number, referred to as the "CID", or Card Identification Number. It is printed flat, not embossed like the card number.
The value of this system of security may be disputed. Anybody who can look at the card or recive payment orders with this validation code can know its value. For this reason it can not be anymore consider that the only person who know the code is the legittate owner of the card after the card is used the first time (or even before that, if anybody can look at the card). Morover the value is also known by the credit card society.
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