title: Since couple of days Refresh token has been automatically expired
body: <ol>
  <li>We have Google OAuth2 Web client at Google API Console</li>
  <li>With the help of Oauth Web Client, we get Refresh token for each Users ( By using web Authentication &amp; Concert Screen )</li>
  <li>We store received Refresh Token to database and, System user this user specific Refresh token to create Google Calendar Event automatically on behalf of logged in user ( We have around 1000 Users)</li>
  </ol>
  <p>Problem : Since couple of days Refresh Token has been expired automatically and getting following error.</p>
  <p>{
  &quot;error&quot;: &quot;invalid_grant&quot;,
  &quot;error_description&quot;: &quot;Token has been expired or revoked.&quot;
  }</p>
  <p>When user do re-registration System receive new Refresh token and everything again start working, however after some time ( no sure but in less then day or two ) again they start getting  Token has been expired or revoked error.</p>
  <p>Is there any Limit has been expose on Refresh Token ?
  Is there any Limit to get Refresh Token  by using Same API Client? ( We have individual 1000 Gsuit or Gmail user who have registered for Refresh Token individually using by using their person Gmail or Gsuit Account)
  Is there any API change to get long live Refresh token ?</p>
  <p>Regards,
  DP</p>