 | -SPY-
hey guys if you signup for this forum please publish it.
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| | | Hey wanna see how are the credit card numbers made. |  Tue Sep 30, 2008 2:44 am by spy2695 | don't be  to see this.
A credit card number must be from 13 to 16 digits long. The last digit of the number is the check digit. That number is calculated from an algorithm (called the Luhn formula or MOD 10) on the other numbers. This is to spot typos when a user enters a number, and I assume was to allow detecting an error reading the magnetic stripe when a card is swiped.
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