<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Sales:etc/sales.xsd">
    <section name="quote">
        <group name="totals">
            <item name="customfee" instance="Zhik\Dropship\Model\Checkout\CustomFee" sort_order="500"/>
        </group>
    </section>
    <section name="order_invoice">
        <group name="totals">
            <item name="customfee" instance="Zhik\Dropship\Model\Invoice\Total\CustomFee" sort_order="600"/>
        </group>
    </section>
</config>
