public function getAVSHash()
    {
        $parts   = array();
        $parts[] = $this->getCard()->getAddress1();
        $parts[] = $this->getCard()->getPostcode();
        $parts[] = $this->getCard()->getCity();
        $parts[] = $this->getCard()->getState();
        $parts[] = $this->getCard()->getCountry();
        return implode('|', $parts);
    }