public function parseXml($response)
    {
        parent::parseXml($response);
        $listSubscriptionsResultXml = new \SimpleXMLElement($response);
        $this->_subscriptionInfos = [];
        foreach ($listSubscriptionsResultXml->entry as $entry) {
            $subscriptionInfo = new SubscriptionInfo();
            $subscriptionInfo->parseXml($entry->asXML());
            $this->_subscriptionInfos[] = $subscriptionInfo;
        }
    }