While it's been a long time since I played in Apple's sandbox, I can tell you from experience in Google's that this is most certainly not how things work for yo

While it's been a long time since I played in Apple's sandbox, I can tell you from experience in Google's that this is most certainly not how things work for your average app store developer.[1] The transaction is between the customer and the app store (i.e. Apple/Google) and the app store then acts as an intermediary telling your app if the user (effectively just a meaningless ID number from the App point of view) is authorized etc. About the only times a developer even knows that someone is a user of their app is when they need support or leave a review. [1] There was a very brief period of time in the early days of Google supporting paid apps when some very limited customer information was provided (iirc, it was maybe email address and city level information) but that changed very quickly and I don't believe Apple ever provided this.