title: Coordinate API OAuth2 authentication with refresh token
body: <p>I am looking for a sample code to authenticate Coordinate API using OAuth2 with an existing refresh token. I am looking for something similar in the thread <a href="https://stackoverflow.com/questions/17177262/google-coordinate-oath2-with-service-account">Google Coordinate OAuth2 with Service Account</a>. I have tried that code snippet but I faced some issue due to the dll conflict. And from the nuget library it seems like the <code>Google.Apis.Authentication.OAuth2</code> is deprecated and we should use <code>Google.Apis.Auth</code>instead.</p>
  
  <p>So If somebody can provide a sample code which will work with <code>Google.Apis.Auth</code> that would be great.</p>
  
  <p>Please help. </p>