[thatjoeoverthr]

Related: requiring one specify a US state. I hit this yesterday, with a modern AI SAAS!

Once I hit this with zip code validation. Knowing that the credit card processor doesn't actually check this, I found a particular state (Arkansas) that happened to include my Polish postal code. This worked and I paid my bill.

[CalRobert]

On a recent trip to the US I found using 00000 works.

[nicbou]

In Canada use H0H 0H0. This is Santa's postal code.