For foreign credit cards oftentimes entering 00000 or 99999 for zip code works. The other thing that sometimes works is entering the digit part of your postal

For foreign credit cards oftentimes entering 00000 or 99999 for zip code works. The other thing that sometimes works is entering the digit part of your postal code and padding it out with zeros. Ex: if your postal code was 1A2B3C you'd enter 12300.