I'm from Ireland and when I put in the correct postal code for billing address it refuses to take it. It just keeps saying "postal code may be empty or for Dublin, please enter a one or two-digit code, or a digit followed by a letter". What do I do??
Is your Apple ID in the correct location?
Change your Apple ID country or region
You might also find the following article helpful in making changes to your payment information
Change, add, or remove Apple ID payment methods
If you still have this issue, you may need to then contact iTunes Support
There is another article regarding another user facing the same error message as you, with advice from a Community Specialist, you can see that thread at Updating Payment Info - Apple Community
Is your Apple ID in the correct location?
Change your Apple ID country or region
You might also find the following article helpful in making changes to your payment information
Change, add, or remove Apple ID payment methods
If you still have this issue, you may need to then contact iTunes Support
There is another article regarding another user facing the same error message as you, with advice from a Community Specialist, you can see that thread at Updating Payment Info - Apple Community
Why won't apple accept my postal code?
