I'm trying to link up Google Assistant app with my own server. I used "Implicit" account linking process.
Grant Type : Implicit
Client Id : "xxxxxxxx"
Authorization URL : "https://mydomain.login.php"
When I launch the app. Displayed card on home screen as "Link testapp to Google". when click on it redirects my home page and authenticated successfully and return back to app page with accessToken
from my server.
This accessToken added to each request in Google. Till now everything is fine. When I close the session and launch the app again it asks to authentication again. How can I make it implicit authentication only on first time.