title: Changing from free app to paid app on Google Play
body: <p>This question might be off topic, but I wanted to ask the fellow developers. </p>
  
  <p>Is there a way on Google play I could change my free app to a paid app?</p>
  
  <p>What would happen to the existing users if it is allowed? Would they be asked to pay when the new update is available?</p>