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I @gentlemako,
We have a very complete plugin that allows you to managed barcodes in WooCommerce: WooCommerce Ultimate Barcodes. This plugin is also compatible with WooCommerce PDF Invoices & Packing Slips.
That said, if you want to add a simple QR code with the order number, you can achieve it with this code snippet:
/**
* WooCommerce PDF Invoices & Packing Slips:
* Show a QR code encoding the order number after the shop address
*/
add_action( 'wpo_wcpdf_after_shop_address', function( $document_type, $order ) {
printf( '<img src="https://chart.googleapis.com/chart?chs=125x125&cht=qr&chl=%s" />', $order->get_order_number() );
}, 10, 3 );If you haven’t worked with code snippets (actions/filters) or functions.php before, read this guide: How to use filters
I used the QR Codes API from Google Charts to display the QR code, but if you prefer using a different QR codes provider, you can do it just following the same approach.