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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. – Nate Eldredge Jul 9 '15 at 3:30
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    Most gas pimps in the US do not accepts credit cards. Stick to the gas pumps. – Malvolio Jul 9 '15 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. – Michael Hampton Jul 9 '15 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 Aug 5 '15 at 17:45
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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.

  • 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 Jul 9 '15 at 5:51
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    The responses are "approved" and "declined". – Malvolio Jul 9 '15 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 Jul 9 '15 at 7:28
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    @jwenting -- the bank does not return the postal code. The responses are "approved" and "declined". – Malvolio Jul 9 '15 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. – Malvolio Jul 10 '15 at 4:40

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