private function isCouponItem(OrderItem $orderItem)
    {
        return $orderItem->getType() === OrderItem::TYPE_VOUCHER || $orderItem->getType() === OrderItem::TYPE_COUPON;
    }
private function isCouponItem(OrderItem $orderItem)
    {
        return $orderItem->getType() === OrderItem::TYPE_VOUCHER || $orderItem->getType() === OrderItem::TYPE_COUPON;
    }
@param OrderItem $orderItem

@return bool