public function getDomainBackendProperties($domain, $backend)
    {
        return json_decode(self::getClient()->getDomainBackendProperties($this->sn, $domain, $backend));
    }
public function getDomainBackendProperties($domain, $backend)
    {
        return json_decode(self::getClient()->getDomainBackendProperties($this->sn, $domain, $backend));
    }
Return backend properties (for the moment only IP ?? wtf)

@param string $domain
@param string $backend (IPv4)
@return object