view/frontend/layout/pagseguro_payment_checkout.xml
<?xml version="1.0"?>
<!--
/**
* Copyright © 2015 Magento. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceContainer name="content">
<block class="UOL\PagSeguro\Block\Payment\Checkout" name="pagseguro.payment.checkout" template="UOL_PagSeguro::checkout.phtml" cacheable="false"/>
</referenceContainer>
</body>
</page>