Credit Card Processing (Was: london.pm Digest, Vol 57, Issue 4)

[Ovid]

----- Original Message ----
> From: Smylers <Smylers at stripey.com>


> > **  IIRC only the digits from the postcode are used. I'm guessing that
> >     the spec was made in the USA, where ZIPs are only digits.
> 
> My guess  was this was so that merchants taking telephone orders can
> punch them into a  PDQ terminal which only has a numeric keypad. (But I
> have no evidence for  that.)


A friend of mine who maintains a lot of credit card processing software states 
that only numbers are used because people mistype them less often than the 
letters.
 
Cheers,
Ovid--
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