From: anansi <kazaam@...>
Date: 2007-04-28T05:10:06+09:00
Subject: Re: [QUIZ] Checking Credit Cards (#122)

James Edward Gray II wrote:
> On Apr 27, 2007, at 12:58 PM, Matthew Moss wrote:
>> So is a card number like "4012 3456 7890" a valid Unknown, or an 
>> invalid Visa?
> 
> Visa Invalid
> 
> Always match the type first.
> 

Nope thats no Visa number but a unknown one. Visa Cards have a certain 
length (13 or 16) and if that length doesn't fit (Matthew's number here 
had just 12 digits)it's unknown :) otherwise the length would be 
obsolete don't you think?
Both length and startingbytes have equal weight in the decision wether a 
card belongs to a known Company or not.


-- 
greets
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