Postcode
Hi, I'm trying to add a payment method to my account but it keeps saying that the postcode is invalid. We don't have postcodes here, I've tried none but it doesn't work
iPad Air, iOS 12
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If your country does not use Postcodes and the iTunes store payment screen is asking for one, then your Apple ID is set to a country that is not the one the payment method you are trying to use is for.
If your Apple Id is set to the U.S, then you can only use U.S payment methods with U.S billing addresses.
If you are trying to use a payment method from a different country, then make sure your Apple ID is set to that country. Then the billing address requirements will be specific to that country.
See here: Change your Apple ID country or region - Apple Support