PMPro - MMPU Override Checkout Page

pmpro-mmpu-override-checkout-page.php

<?php
/**
 * The recipe checks for a /paid-memberships-pro/pages/checkout.php in the child theme
 * Please keep checkout.php up to date as MMPU is updated.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_pmprommpu_override_user_pages( $templates, $page_name, $type, $where, $ext ) {
	if ( 'checkout' !== $page_name ) {
		return $templates;
	}
	// Place checkout.php in _child_theme_/paid-memberships-pro/pages/
	// Only works with MMPU.
	// Can further customize this gist to override more templates.
	$pmpro_checkout_page = get_stylesheet_directory() . "/paid-memberships-pro/pages/checkout.php";
	if ( file_exists( $pmpro_levels_page ) ) {
		$templates = array( $pmpro_levels_page );
	}
	return $templates;
}
add_filter( 'pmpro_pages_custom_template_path', 'my_pmpro_pmprommpu_override_user_pages', 11, 5 );