Multiply each digit in the credit card by its "weight". If a charge card has an even number(16 digit card number) of digits, the first digit has a weight of 2, otherwise the digit has weight of 1. Afterwards, the weights of the digits alternate 1,2,1,2.
If any digit has a weighted value that is more than 9, Subtract 9.
Add together the weights of all the digits, modulo 10.
the result should be zero for a valid credit card.
Here is the card number: 3728 024906 54059
The above charge card has 15 digits. the number is odd, So the first digit has a weight of 1. to compute the check digit, we multiply:
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