SKExternalPurchaseCustomLinkRegions
An array of country code strings that indicate the regions where your app supports custom links for the communication and promotion of offers.
Discussion
Use this information property list key if your app has the com.apple.developer.storekit.external-purchase-link entitlement and uses the ExternalPurchaseCustomLink API.
Include an entry for each country code where your app supports custom links for the communication and promotion of offers.
Valid country codes include the European Union: Austria (at), Belgium (be), Bulgaria (bg), Croatia (hr), Cyprus (cy), Czechia (cz), Denmark (dk), Estonia (ee), Finland (fi), France (fr), Germany (de), Greece (gr), Hungary (hu), Ireland (ie), Italy (it), Latvia (lv), Lithuania (lt), Luxembourg (lu), Malta (mt), Netherlands (nl), Poland (pl), Portugal (pt), Romania (ro), Slovakia (sk), Slovenia (si), Spain (es), Sweden (se).