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Home News Catch-Up ATM Technology How the 'Luhn formula' validates credit card numbers - CreditCards.com
How the 'Luhn formula' validates credit card numbers - CreditCards.com
Friday, 04 June 2010 05:41

How the 'Luhn formula' validates credit card numbers
CreditCards.com
and not as a defense against fraud. It doesn't identify where an invalid number went sideways, it simply flags it as nonconforming. Luhn checking won't tell ...

card validation
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