[ic] Credit card LUHN checking - why we don't want it

interch interchange-users@lists.akopia.com
Mon Jul 9 10:53:00 2001



On Fri, 6 Jul 2001, Martin Dabb wrote:

> LUHN checking doesn't work for cards from all countries, including New
> Zealand where my client's business is - hence I''ll need to find a way to
> turn it off.


That might be true for some lesser known card brands.  Visa, Mastercard,
discover,
and American Express can all be checked using mod 10 no matter what
country they are issued in because they all use the same basic card format
no matter which bank issues the card. 

Chris