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My friend is visiting from Ireland and wants to know what she would use as a zipcode at the gas pump in USA when in Ireland they don't have a zip code ???

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    "Gas pimp": typo of the day. Commented Jul 9, 2015 at 3:30
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    Most gas pimps in the US do not accepts credit cards. Stick to the gas pumps. Commented Jul 9, 2015 at 3:34
  • Either, "00000", or the numbers only from their Eircode, prepended by enough "0"s to make five digits, or pay inside the store. Commented Jul 9, 2015 at 17:27
  • I haven't been able to pump gas with a non-US issued credit card, regardless of the zipcode. When I want to pay with that, I have to go inside, they will swipe the card and enable the pump station for the amount they swiped the card. Once you're done, you can go back in and ask them to refund you the unused money.
    – g3rv4
    Commented Aug 5, 2015 at 17:45

1 Answer 1

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You are misunderstanding the system.

You think that you give a card and a zip-code and the machine says the bank, "Is Jon Kline good for $13.50?" and the bank says back, "Yes, if he knows that his zip code is 12345."

No, the way it works is the machine says to the bank, "Is Jon Kline who resides in the 12345 zip code good for $13.50?" and the bank says yes or no.

Your bank, being in Ireland, where they do not have zip-codes, is likely to disregard the zip-code and approve the sale, or not, on other criteria.

tl;dr: Enter 00000.

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  • problem is that if you enter 00000 and the bank responds with " " the gas pimp (or pump ;) ) will likely refuse the transaction in that case because it receives a different code back from the one it expects.
    – jwenting
    Commented Jul 9, 2015 at 5:51
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    The responses are "approved" and "declined". Commented Jul 9, 2015 at 7:20
  • you wrote that the bank does nothing with the postal code, and it's later compared on the machine. So if the bank doesn't return the postal code yet the machine expects it, it will always decline the transaction because it compares nothing with something, which never matches.
    – jwenting
    Commented Jul 9, 2015 at 7:28
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    @jwenting -- the bank does not return the postal code. The responses are "approved" and "declined". Commented Jul 9, 2015 at 13:49
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    Re-read my answer. That was (my interpretation of) the OP's misunderstanding of the process. The bank never sends personal information about the card-holder to the merchant. Commented Jul 10, 2015 at 4:40

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