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Hi, We are selling physical goods that will be used in combination with an app that we provide to our users. The app features will be unlocked after the user purchases a monthly/yearly plan. I should mention that the app features that the user unlocks are directly tied to the physical good that they have already purchased (e.g. seeing data from a physical device in the app). Now I wonder if we can do these sales outside of the app store or that we have to do the physical sale outside of the app and the subscription still has to go through the app store. The guidelines provide information about either only physical goods or features that are unlocked in the app that are not tied to any physical item. Thanks,