WordPress customizer a certain page on accessing a certain section

customizer-preview-certain-page.php

<?php

add_action( 'customize_controls_print_scripts', 'custom_customize_controls_print_scripts', 30 );
function custom_customize_controls_print_scripts() {
    ?>
    <script type='text/javascript'>
        jQuery( function( $ ) {
            wp.customize.panel( 'customize_checkout_settings', function( section ) {
                section.expanded.bind( function( isExpanded ) {
                    if ( isExpanded ) {
                        wp.customize.previewer.previewUrl.set( '<?php echo esc_js( home_url( '/checkout/' ) ) ?>' );
                    } else {
                        wp.customize.previewer.previewUrl.set( '<?php echo esc_js( home_url() ) ?>' );
                    }
                } )
            } );
        } );
    </script>
    <?
}