public function get($type)
    {
        if ($type != 'request_token' && $type != 'access_token') {
            throw new \Dropbox\Exception("Expected a type of either 'request_token' or 'access_token', got '$type'");
        } else {
            if (isset($_SESSION[$this->namespace][$this->userID][$type])) {
                $token = $this->decrypt($_SESSION[$this->namespace][$this->userID][$type]);
                return $token;
            }
            return false;
        }
    }