Background
The Android developer console has 3 tabs for publishing the app's apk file: alpha, beta and production, as shown here:
as I recall from one of Google IO lectures, one cool way to check how good is your app before making a 100% scale publishing, is to allow only a percentage of the users to download the app first. I think it's called "staged rollouts" , because you can rollout the publishing in case it had too many problems to be published to all.
My question
What is exactly the difference between them, especially between Alpha and Beta?
Only the production stage is available for people on the play store, right?
which one/s allow to publish only to specific people/percentage , and in which way do you do it?
which stage allows in-app billing, at least for testing ? I don't get why can't i test it out even before uploading the app.
in the percentage method, if I publish a new app version using the same way, will it first update for the people who were lucky enough to install the previous version?