Are you a Canadian having difficulty paying at U.S. pumps? The problem is the requirement that a zip code be entered at pay-at-the-pump locations. This Address Verification Service security tool doesn’t always recognize Canadian postal codes, which include letters as well as numbers.
Try when prompted to enter the three numbers in your postal code, and two zeroes. So if your postal code is Z3G 6B7, you would enter 36700. MasterCard says this will usually work with their card, but doesn’t guarantee it will at every gas station. In those cases you might have to pay inside some places – like in the old days.

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