Hello,
I would like to know if the folllowing process is permitted by Apple:
We have an offline product a book and we have an app. The app is the digital version of the book. We would like to give users who buy a book a voucher. With this voucher the user should be able to download a digital version of the same book in the app for free. All other users without a voucher have to make an in-app purchase through Apple.
To do so we would generate ourself the voucher codes for the offline product. In the app the user than would be able to enter his voucher code and download a digital version of the book without an in-app purchase mechanism from Apple.
Kind regards,
Dennis