I followed the official Apple documentation to integrate external puchase, but after adding the com.apple.developer.storekit.external-purchase key to the entitlements plist file, I got the following error: "Provisioning profile "{company name}" doesn't include the com.apple.developer.storekit.external-purchase entitlement." error and fails to build.
https://developer.apple.com/support/storekit-external-entitlement-kr/