Add stamp image to invoice

Hi @samuelmarcinko,

Try the following code snippet:

/**
 * PDF Invoices & Packing Slips for WooCommerce:
 * Displays a "Paid" stamp after the customer notes
 */
add_action( 'wpo_wcpdf_after_customer_notes', function( $document_type, $order ) {
	$stamp_url = "https://i.ibb.co/fdYKYX74/Paid-stamp.jpg";
	echo '<img style="width:5cm" src="' . $stamp_url . '">';
}, 10, 2 );

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

We also have a blog post here that you may find helpful about adding custom code to your site.