Adding One Line Below Weight

Hello @agusapri,

Do you by any chance know the meta key under which the barcode is saved in the order? Finding WooCommerce Custom Fields

Is this an order barcode or a product barcode?
Displaying Product custom fields
Displaying Custom fields

It’s Product Barcode.

Please see this screenshot, https://kutabali.my.id/Screenshot.png for Order Post Meta Key (I am not sure how tell you).

Thanks for confirming that it is a product barcode, @agusapri!

Please try adding this code snippet to display the product barcode after the item meta:

/**
 * PDF Invoices & Packing Slips for WooCommerce:
 * Add the product barcode (number) after the item meta
 */
add_action( 'wpo_wcpdf_after_item_meta', function( $template_type, $item, $order ) {    
    if ( isset( $item['product'] ) && ! empty( $barcode = $item['product']->get_meta( 'barcode' ) ) ) {
        echo "<div class=\"barcode\">Barcode: {$barcode}</div>";
    }
} , 10, 3 );

If you haven’t worked with code snippets (actions/filters) or functions.php before, read this guide: How to use filters