Receive param value from xml in php component joomla 4

gistfile1.txt

My XML

<?xml version="1.0" encoding="UTF-8"?>
<extension type="component" version="3.0" method="upgrade">
	<name>testepar</name>
	<creationDate>Outubro 2023</creationDate>
	<author>Ribamar FS</author>
	<authorEmail>[email protected]</authorEmail>
	<authorUrl>https://ribamar.net.br</authorUrl>
	<copyright>Copyright (C) 2016 Ribamar FS. All rights reserved.</copyright>
	<license>http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL</license>
	<version>2.0</version>
	<description>Componente de teste de envio de parametro Joomla</description>

	<administration>
		<menu>COM_TESTEPAR</menu>
		<files folder="admin">
			<filename>testepar.php</filename>
		</files>
    <config>
        <fields name="params">
            <fieldset name="backup">
                <field name="testepar" default="none" />
            </fieldset>
        </fields>
    </config>
	</administration>
</extension>

My PHP

<?php
/**
* @author-name Ribamar FS
*/

defined('_JEXEC') or die('Restricted access');

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);


$param=JComponentHelper::getParams('com_teste')->get('testepar');

print "OK?";

print $param;

?>

Result
blank page