title: Use API key with googleapis androidpublisher
body: <p>I'm building a server locally with NPM to get information from google play publisher.
  I'm trying to user API key but I'm unable to connect.
  const publish = google.androidpublisher({
  version: 'v3',
  auth: '****'
  });
  From looking in the internet I'm seeing that I need to use OAuth2.
  The problem is that I want this as a service and only a server side without user interaction.
  Is there a way to do it?</p>