src/Ovh/Cdn/Cdn.php
public function addDomainBackend($domain, $backend)
    {
        return json_decode(self::getClient()->addDomainBackend($this->sn, $domain, $backend));
    }
public function addDomainBackend($domain, $backend)
    {
        return json_decode(self::getClient()->addDomainBackend($this->sn, $domain, $backend));
    }
Add backend (IPv4) to domain $domain

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