<?php
$template = get_theme_mod('wpw_product_single_template');
get_header();
if (!empty($template) && is_numeric($template)) {
    $current_page = get_post($template);
    if (isset($current_page->post_content)) {
        global $post;
        setup_postdata($current_page);
        $post = $current_page;
        echo apply_filters('shortcode_output', $current_page->post_content);
    } else {
        get_template_part('templates/product/single');
    }
} else {
    get_template_part('templates/product/single');
}
get_footer();