def access_token
      @access_token ||= ShakeTheCounter::Authentication.renew_access_token(client_id: id, client_secret: secret, refresh_token: refresh_token)["access_token"]
    end
def access_token
      @access_token ||= ShakeTheCounter::Authentication.renew_access_token(client_id: id, client_secret: secret, refresh_token: refresh_token)["access_token"]
    end
Retrieves a new authentication token to use for this client
 or reuse the same one from memory.