А с незападными уже всё хорошо? Если нет, то забудьте о работе на неродном языке.
Important
Verify your receipt first with the production URL; proceed to verify with the sandbox URL if you receive a 21007 status code. Following this approach ensures that you do not have to switch between URLs while your application is tested, reviewed by App Review, or live in the App Store.
https://developer.apple.com/documentation/appstore...
21007
This receipt is from the test environment, but it was sent to the production environment for verification.
Alternate URL for Sandbox Testing
The sandbox URL for verifying receipts is:
POST https://sandbox.itunes.apple.com/verifyReceipt