I do something similar. I have a Android app that I sell outside of the app store. I did build some licensing and support infrastructure to allow for automatic

I do something similar. I have a Android app that I sell outside of the app store. I did build some licensing and support infrastructure to allow for automatic notification of updates. There is also a Beta release channel. Therefore, I use the support conversation in order to see if they want to be flipped to that channel. I also use ACRA and Tracepot to capture crashes and anomalous events. Users can also email me a debug log along with their current app settings. This has evolved over a 5 or 6 year period.