/**
* SagePay throws an error if passed an IPv6 address.
* Filter out addresses that are not IPv4 format.
*/
public function getClientIp()
{
$ip = parent::getClientIp();
// OmniPay core could do with a helper for this.
if (!preg_match('/^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$/', $ip)) {
$ip = null;
}
return $ip;
}