Why can’t I use my foreign credit card AppStore
my bank account is in Europe and my AppStore is Beirut
iPhone 11 Pro Max
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There is no simple statement from Apple saying this but the bottom line is if you want to use the store in a country you also need a payment form from that country.
It is kind of buried in the legalese here and other Apple documents, but even then it is not stated outright:
https://www.apple.com/legal/internet-services/itunes/us/terms.html