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From: nospam on 17 Jun 2010 10:04 In article <michelle-DA038E.05505017062010(a)62-183-169-81.bb.dnainternet.fi>, Michelle Steiner <michelle(a)michelle.org> wrote: > And I've never had a gas pump ask for my ZIP code when I've used a VISA or > Mastercard. i have.
From: nospam on 17 Jun 2010 10:04 In article <michelle-18321B.05485717062010(a)62-183-169-81.bb.dnainternet.fi>, Michelle Steiner <michelle(a)michelle.org> wrote: > I'm missing something here. Where in the article does it say that the > FileMaker database checks those six digits? from what he said, filemaker was checking the validity of the entire credit card number, not the bank id.
From: nospam on 17 Jun 2010 10:04 In article <michelle-138BE2.05372917062010(a)62-183-169-81.bb.dnainternet.fi>, Michelle Steiner <michelle(a)michelle.org> wrote: > > This database is checking for many different combinations of the first > > four digits. It identifies anything starting with 4 as Visa, 5 with > > certain values of the second digit as Mastercard, and a whole bunch of > > other card types which I haven't looked into in detail. > > American Express cards all begin with 3. others also begin with 3.
From: =?ISO-8859-1?Q?Kir=E1ly?= on 17 Jun 2010 12:57 In comp.sys.mac.apps Wes Groleau <Groleau+news(a)freeshell.org> wrote: > > And I've never had a gas pump ask for my ZIP code when I've used a VISA or > > Mastercard. > > My experience is that around ten percent do. I wonder what would happen if I visited the USA and used my credit card at such a gas pump. I usually use cash outside of Canada so I will probably never find out. -- K. Lang may your lum reek.
From: Davoud on 17 Jun 2010 13:07
Michelle Steiner: > > Yes, there are those three digits on the back of AMEX cards, but I've > > never had anyone check those; they all check the four on the front. In theory, no human is supposed to see those numbers, because a person who has your card number but lacks those digits _supposedly_ can't use your card on-line. I don't know why AMEX puts them on the front for the world to see. > > And I've never had a gas pump ask for my ZIP code when I've used a > > VISA or Mastercard. I never heard of such a thing, but I buy petrol with a debit card. Johan W. Elzenga: > I have when I was in the USA and that's a pain because we use a > different code system in my country, that is not recognised by the > gaspump. It means I have to go inside first to get my card accepted. It > differs from state to state, though. Is the zip code a security measure in that it is matched with info encoded on your card, or does it represent the collection of marketing data? If the former, I guess you have to comply. If the latter, punch in any zip code. When I'm asked for a zip code at a retailer I give a zip code other than my own. They're looking for places to locate new stores. I don't want any stores to be _too_ convenient to my home! Davoud -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |