private function _addressDigestPart(KlarnaAddr $address = null)
    {
        if ($address === null) {
            return array();
        }

        $keyOrder = array(
            'careof', 'street', 'zip', 'city', 'country', 'fname', 'lname'
        );

        $holder = $address->toArray();
        $digest = array();

        foreach ($keyOrder as $key) {
            if ($holder[$key] != "") {
                $digest[] = $holder[$key];
            }
        }

        return $digest;
    }