code: private synchronized void startAuthenticateUI(BoxSession session) {
          Context context = session.getApplicationContext();
          Intent intent = OAuthActivity.createOAuthActivityIntent(context, session, BoxAuthentication.isBoxAuthAppAvailable(context) && session.isEnabledBoxAppAuthentication());
          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          context.startActivity(intent);
      }
docs: Start authentication UI.
  
  @param session the session to authenticate.