[thelist] asp code to verify credit cards

Seb seb at poked.org
Tue Jul 22 12:29:42 CDT 2003


On Tue, 22 Jul 2003 17:56:27 +0100, David Turner <david.turner at synergy.tv> 
wrote:

> hi all,
>
> does anybody have any asp code that verifies all the following cards?
>
> Visa
> Master Card
> Discover
> American Express
> -----------
> Diners Club
> enRoute Card
> JCB Card
> -----------
> Switch
> Delta
> Solo
>
> i am hoping for open source code/ freeware.

Hi David,

What do you mean by "verify"? If you're looking for a simple digit check to 
ensure the card number is a valid card number, there's the Luhn Mod 10 
algorithm. Here's a google that will provide links to sites with various 
language-specific methods of checking:

http://www.google.com/search?q=mod+10+credit+card+number&sourceid=opera&num=100&ie=utf- 
8&oe=utf-8

Worth noting is the first result:

http://www.beachnet.com/~hstiles/cardtype.html

Which lists the prefix digits of common card types, so you can quickly 
reject nonsense card numbers.

If by "verify" you mean actually perform the transaction or compare the 
provided details against an actual account, then you're in the realm of 
pay-for third-party authentication servers, such as datacash, worldpay, 
etc.

- seb

-- 
http://poked.org


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