I had built an app a couple of months ago and I want to sell it now. The app internally uses Firebase, google OAuth, and a few other services which I had registered with my personal email ID. Now If I sell it to someone else should I give away my credentials along with the app or should I ask them to create their own? and how can I transfer all the data smoothly(eg. Firestore data) which is currently in my account? If anyone has ever done this, could you please suggest what to do?