[ic] limiting credit card types accepted?

[interchange-users@interchange.redhat.com (Kevin Walsh)]

> 
> I have a functioning site, which I thought was configured to accept 
> only Visa & Mastercard.   However, orders are successful when 
> Discover numbers are entered.
> 
> ...
> 
> Is there a setting to turn on credit card type validation that I've 
> missed?  Or does this require additional coding?
> 
That would require additional coding to detect whether the card
number entered is indeed a Visa or a MasterCard.  Perhaps you could
write a custom profile value check function.

For your information:

    MasterCard:
        Number length: 16
        Number prefix: 51, 52, 53, 54 or 55

    Visa:
        Number length: 13 or 16
        Number prefix: 4

Feel free to correct me if I'm wrong. :-)

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