public function getClientToken()
    {
        $client = app('db')->connection()->table('clients')
            ->where('client_id', config('services.northstar.client_credentials.client_id'))
            ->first();

        // If any of the required fields are empty, return null.
        if (empty($client->access_token) || empty($client->access_token_expiration)) {
            return null;
        }

        return new AccessToken([
            'access_token' => $client->access_token,
            'expires' => $client->access_token_expiration,
        ]);
    }