magento-test/app/code/Magento/Quote/Test/Mftf/Metadata/CustomerCartMeta.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="CreateCustomerCart" dataType="CustomerCart" type="create"
               auth="adminOauth" url="/V1/carts/mine" method="POST" >
        <contentType>application/json</contentType>
        <field key="customer_id">string</field>
    </operation>

    <operation name="AddAddressInfoToCustomerCart" dataType="CustomerAddressInformation" type="create" auth="adminOauth" url="/V1/carts/mine/shipping-information" method="POST">
        <contentType>application/json</contentType>
        <field key="cart_id">string</field>
        <object key="addressInformation" dataType="CustomerAddressInformation">
            <object key="shipping_address" dataType="shipping_address">
                <field key="city">string</field>
                <field key="region">string</field>
                <field key="region_code">string</field>
                <field key="region_id">integer</field>
                <field key="country_id">string</field>
                <array key="street">
                    <value>string</value>
                </array>
                <field key="postcode">string</field>
                <field key="firstname">string</field>
                <field key="lastname">string</field>
                <field key="email">string</field>
                <field key="telephone">string</field>
            </object>
            <object key="billing_address" dataType="billing_address">
                <field key="city">string</field>
                <field key="region">string</field>
                <field key="region_code">string</field>
                <field key="region_id">integer</field>
                <field key="country_id">string</field>
                <array key="street">
                    <value>string</value>
                </array>
                <field key="postcode">string</field>
                <field key="firstname">string</field>
                <field key="lastname">string</field>
                <field key="email">string</field>
                <field key="telephone">string</field>
            </object>
            <field key="shipping_method_code">string</field>
            <field key="shipping_carrier_code">string</field>
        </object>
    </operation>

    <operation name="SendCustomerPaymentInformation" dataType="CustomerPaymentInformation" type="update" auth="adminOauth" url="/V1/carts/mine/payment-information" method="POST">
        <contentType>application/json</contentType>
        <field key="cart_id">string</field>
        <object key="paymentMethod" dataType="payment_method">
            <field key="method">string</field>
        </object>
    </operation>

    <operation name="GetOrderData" dataType="CustomerCart" type="get" auth="adminOauth" url="/V1/orders/{return}" method="GET">
        <contentType>application/json</contentType>
    </operation>

</operations>