Top-level Product Category List Shortcode

wc-shortcode-top-level-product-category-list.php

<?php
/*
 * The shortcode is [top_level_product_categories_list] 
 */
add_shortcode('top_level_product_categories_list', 'wc_shortcode_top_level_product_categories_list');

function wc_shortcode_top_level_product_categories_list() {
    
   ob_start();
   
   $args = array(
        'taxonomy' => 'product_cat',
        'parent' => 0
    );
    
    $product_categories = get_categories($args);
	
    echo '<ul>';
    
    foreach ($product_categories as $category) {
        echo '<li><a href="' . get_term_link($category->slug, 'product_cat') . '">' . $category->name . '</a></li>';
    }
	
    echo '</ul>';
    
    return ob_get_clean();
}