One last question, assuming we proceed with managed app pricing!
Concerning the initial app subscription, we know how to redirect the merchant to the plan selection page, as mentioned in the Managed App Pricing documentation.
Once the merchant has subscribed, and can now fully access the application, are we obliged to show them an unsubscribe button/link in the pages of our app? Will the merchant be able to see a similar action button in the settings of the application (Settings > Apps & Sales Channels)? Or will they have to uninstall the app entirely, to unsubscribe from the app?