title: How to access my google drive from php script without manual authorisation
body: <p>I want to write a server php script which will access my google drive and copy a file there. 
  The server has to save credentials for my google drive and not ask for authorisation. 
  All the examples I saw describe web applications there various users can perform actions on their drives. For example here <a href="https://developers.google.com/drive/v3/web/quickstart/php" rel="nofollow noreferrer">https://developers.google.com/drive/v3/web/quickstart/php</a>
  How can I save all the needed credentials on my server.</p>