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