com.apple.developer.storekit.custom-purchase-link.allowed-regions
An entitlement that enables a qualifying app to offer external purchases within app or at a website, in specific regions.
Discussion
This entitlement enables a qualifying app to offer external purchases within the app or at a website of its choice, in specific regions.
If your account receives this entitlement, you can add it to your app by opening the project’s .entitlements file in Xcode. Then, add a key named com.apple.developer.storekit.custom-purchase-link.allowed-regions, followed by an array that enumerates the two-letter ISO-3166-1 country codes for the allowed regions. The example below describes an entitlement that includes Japan as the allowed region that the app supports.
<plist>
<dict>
<key>com.apple.developer.storekit.custom-purchase-link.allowed-regions</key>
<array>
<string>jp</string>
</array>
</dict>
</plist>For more information, see External Purchase.