Quote:
Originally Posted by Skip
Sorry - not possible, all the digits have to add up to the checksum. Change one digit and the card number is not a valid one, so the charge won't go through. It's known as the Luhn Algorithum. You can't just make up a card number. Reason you got charged was because your number was lifted somewhere including your expiration date.
Skip
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Very interesting info... I googled Luhn Alogrithum, but didn't care to follow the math! Thanks for sharing...Something I never knew about credit card account numbers!
I would guess American Express works the same? They have more digits...my wife and I share an account, each card has the same digits until the last few.