public function associateAccessToken($sessionId, $accessToken, $expireTime)
    {
        return DB::table('oauth_session_access_tokens')->insertGetId(array(
            'session_id'           => $sessionId,
            'access_token'         => $accessToken,
            'access_token_expires' => $expireTime,
            'created_at' => Carbon::now(),
            'updated_at' => Carbon::now()
        ));
    }