magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/GuestCheckoutSelectPaymentAndFillNewBillingAddressActionGroup.xml

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

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <actionGroup name="GuestCheckoutSelectPaymentAndFillNewBillingAddressActionGroup" extends="GuestCheckoutFillNewBillingAddressActionGroup">
        <annotations>
            <description>EXTENDS: GuestCheckoutFillNewBillingAddressActionGroup. Clicks on the provided Payment Method on the Storefront Checkout page.</description>
        </annotations>
        <arguments>
            <argument name="paymentMethod" type="string"/>
        </arguments>

        <waitForElement selector="{{CheckoutPaymentSection.paymentSectionTitle}}" time="30" after="waitForLoading3" stepKey="waitForPaymentSectionLoaded"/>
        <conditionalClick selector="{{CheckoutPaymentSection.paymentMethodByName(paymentMethod)}}" dependentSelector="{{CheckoutPaymentSection.billingAddress}}" visible="false" before="enterFirstName" stepKey="clickCheckMoneyOrderPayment"/>
    </actionGroup>
</actionGroups>