Code snippet to alter product image URL in documents - by WebToffee ( WooCommerce PDF Invoice, Packing Slips, Delivery Notes and Shipping labels (free)

functions.php

<?php //Do not copy this line of code
add_filter('wt_pklist_alter_product_image_url', 'wt_pklist_alter_product_image_url_fn', 10, 4);
/**
 * Filter to customize the product image URL in packing lists.
 *
 * This function allows you to set a custom image URL for a product.
 * If a custom image URL is available, update the `$img_url` variable to use that URL.
 * @return string The updated image URL to be used in the packing list.
 */
function wt_pklist_alter_product_image_url_fn($img_url, $product_id, $variation_id, $parent_id) {
    // Retrieve your custom image URL here (if needed)
     $img_url = 'http://backend-test.local/wp-content/uploads/2024/08/images-1.jpeg';
    return $img_url;
}