Jim,
There are more than a few CF tags used for verifying that a card number
is valid. Search the tag gallery for that. As for identifying card
types, here's the key that I use:
Starts with... Type
3 Amex / Diner's Club
4 Visa
5 Mastercard
6 Discover
HTH
Lee
> -----Original Message-----
> From: Jim McAtee [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, November 28, 2001 8:16 PM
> To: CF-Talk
> Subject: Credit Card Validation
>
>
> Can anyone point me toward an authoritative source for the
> algorithms used to validate credit card numbers and to
> identify card types based on the card number? There are
> numerouse code examples to be found on the web, in various
> languages (but with significant differences in both the
> checksum validation and in the card identification). I'd
> like to find a source that I can have a little more confidence in.
>
> Thanks,
> Jim
>
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