sales.xml

<?xml version="1.0"?>
<!--
/**
 * Bdcrops
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Bdcrops.com license that is
 * available through the world-wide-web at this URL:
 * https://www.bdcrops.com/LICENSE.txt
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this extension to newer
 * version in the future.
 *
 * @category    Bdcrops
 * @package     Bdcrops_GiftCard
 * @copyright   Copyright (c) Bdcrops (https://www.bdcrops.com/)
 * @license     https://www.bdcrops.com/LICENSE.txt
 */
-->
<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="gift_card" instance="Bdcrops\GiftCard\Model\Total\Quote\Discount" sort_order="700"/>
        </group>
    </section>
    <section name="order_invoice">
        <group name="totals">
            <item name="gift_card" instance="Bdcrops\GiftCard\Model\Total\Invoice\Discount" sort_order="500"/>
        </group>
    </section>
    <section name="order_creditmemo">
        <group name="totals">
            <item name="gift_card" instance="Bdcrops\GiftCard\Model\Total\Creditmemo\Discount" sort_order="500"/>
        </group>
    </section>
    <order>
        <available_product_type name="mpgiftcard"/>
    </order>
</config>