I believe it's a US credit card thing. Not sure if anything actually checks the zip code nowadays. A long time ago, I almost got stranded in the US with my (Eur

I believe it's a US credit card thing. Not sure if anything actually checks the zip code nowadays. A long time ago, I almost got stranded in the US with my (European) credit card, and I suspect it had to do with not being able to provide a fitting zip code (different formats).