When user’s buy an app on Google’s Play Store the full personal information stored for purchasing purposes are shared with the app’s developer.
This fact can only be found in the fine print of the company’s terms of services and is not communicated to the end user’s in a way of making them aware of this violation of privacy.
source: https://gadgets360.com/apps/news/google-play-store-policy-raises-privacy-concerns-331116
archived source: https://wellthissucks.xyz/2013/02/15/google-play-store-shares-personal-user-information-with-app-developers-archived-source/