[thelist] php javascrip CC validation

K Frey kristenannfrey at yahoo.com
Fri Apr 12 12:55:01 CDT 2002


> Luhn
> algorithm will catch simple typos, thus lightening the load on your
> authentication service.

I've heard that some companies charge for every hit to their service for
authorization, so stopping invalid #s (and expired cards for that matter)
from even reaching the authorization step may save money.




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