magento-test/app/code/Magento/Customer/Test/Mftf/Metadata/CustomerGroupMeta.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<operations xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataOperation.xsd">
    <operation name="CreateCustomerGroup" dataType="customerGroup" type="create" auth="adminOauth" url="/V1/customerGroups" method="POST">
        <contentType>application/json</contentType>
        <object dataType="customerGroup" key="group">
            <field key="code">string</field>
            <field key="tax_class_id">integer</field>
            <field key="tax_class_name">string</field>
        </object>
    </operation>
    <operation name="DeleteCustomerGroup" dataType="customerGroup" type="delete" auth="adminOauth" url="/V1/customerGroups/{id}" method="DELETE">
        <contentType>application/json</contentType>
    </operation>
</operations>