At most, all that MasterCard has to prove is that the information about the work around was posted where the guy could see it [[it could even be buried in some obscure part of their website, as Honky Tonk stated). And that may not even be necessary.
The problem with his lawsuit is he's blaming the fact that he was robbed on the zip code issue. He's not suing about the zip code issue itself, because if he wasn't robbed, I'm sure there would be no lawsuit.
Lastly, as far as the gas station putting something up at the pumps, I don't think that would be a bad idea. But it's ultimately at their discretion to do so. They're under no legal obligation to do so.
Bottom line, neither MasterCard nor the Gas Station owner are responsible for the actions of a 3rd party.
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