newsupernova/vendor/magento/module-checkout/etc/webapi.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">

    <!-- Managing shipping guest information -->
    <route url="/V1/guest-carts/:cartId/shipping-information" method="POST">
        <service class="Magento\Checkout\Api\GuestShippingInformationManagementInterface" method="saveAddressInformation"/>
        <resources>
            <resource ref="anonymous" />
        </resources>
    </route>

    <!-- Managing My shipping information -->
    <route url="/V1/carts/mine/shipping-information" method="POST">
        <service class="Magento\Checkout\Api\ShippingInformationManagementInterface" method="saveAddressInformation"/>
        <resources>
            <resource ref="self" />
        </resources>
        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>
    </route>

    <!-- Managing shipping information-->
    <route url="/V1/carts/:cartId/shipping-information" method="POST">
        <service class="Magento\Checkout\Api\ShippingInformationManagementInterface" method="saveAddressInformation"/>
        <resources>
            <resource ref="Magento_Cart::manage" />
        </resources>
    </route>

    <!-- Managing totals information -->
    <route url="/V1/carts/:cartId/totals-information" method="POST">
        <service class="Magento\Checkout\Api\TotalsInformationManagementInterface" method="calculate"/>
        <resources>
            <resource ref="Magento_Cart::manage" />
        </resources>
    </route>

    <!-- Managing guest totals information -->
    <route url="/V1/guest-carts/:cartId/totals-information" method="POST">
        <service class="Magento\Checkout\Api\GuestTotalsInformationManagementInterface" method="calculate"/>
        <resources>
            <resource ref="anonymous" />
        </resources>
    </route>

    <!-- Managing My totals information -->
    <route url="/V1/carts/mine/totals-information" method="POST">
        <service class="Magento\Checkout\Api\TotalsInformationManagementInterface" method="calculate"/>
        <resources>
            <resource ref="self" />
        </resources>
        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>
    </route>

    <!-- Guest place order with payment information saving -->
    <route url="/V1/guest-carts/:cartId/payment-information" method="POST">
        <service class="Magento\Checkout\Api\GuestPaymentInformationManagementInterface" method="savePaymentInformationAndPlaceOrder"/>
        <resources>
            <resource ref="anonymous" />
        </resources>
    </route>
    <!-- Guest place order with payment information saving -->
    <route url="/V1/guest-carts/:cartId/payment-information" method="GET">
        <service class="Magento\Checkout\Api\GuestPaymentInformationManagementInterface" method="getPaymentInformation"/>
        <resources>
            <resource ref="anonymous" />
        </resources>
    </route>
    <!-- My place order with payment information saving -->
    <route url="/V1/carts/mine/payment-information" method="POST">
        <service class="Magento\Checkout\Api\PaymentInformationManagementInterface" method="savePaymentInformationAndPlaceOrder"/>
        <resources>
            <resource ref="self" />
        </resources>
        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>
    </route>
    <!-- Get payment information -->
    <route url="/V1/carts/mine/payment-information" method="GET">
        <service class="Magento\Checkout\Api\PaymentInformationManagementInterface" method="getPaymentInformation"/>
        <resources>
            <resource ref="self" />
        </resources>
        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>
    </route>

    <!-- Managing payment guest information -->
    <route url="/V1/guest-carts/:cartId/set-payment-information" method="POST">
        <service class="Magento\Checkout\Api\GuestPaymentInformationManagementInterface" method="savePaymentInformation"/>
        <resources>
            <resource ref="anonymous" />
        </resources>
    </route>
    <!-- Managing My payment information -->
    <route url="/V1/carts/mine/set-payment-information" method="POST">
        <service class="Magento\Checkout\Api\PaymentInformationManagementInterface" method="savePaymentInformation"/>
        <resources>
            <resource ref="self" />
        </resources>
        <data>
            <parameter name="cartId" force="true">%cart_id%</parameter>
        </data>
    </route>
</routes>