public function applyModificationTaxRate(Modification $mod)
{
if ($mod->SubTotalModifier) {
$order = $mod->Order();
// Orders shipped within New Zealand have tax applied
if ($order && $order->exists() && $order->ShippingCountryCode == 'NZ') {
$mod->XeroTaxType = 'OUTPUT2';
$mod->XeroTaxRate = 15.0;
} else {
$mod->XeroTaxType = 'NONE';
$mod->XeroTaxRate = 0.0;
}
$mod->write();
}
}
