Displaying product purchase notes

If you have set up purchase notes for your products, there’s two ways of displaying them: in a custom template (for full control over the exact position), or by adding some code (an action) to your themes functions.php

First, you need to create a custom template by following instructions here: Creating a custom PDF template.

Then place the following snippet where you would like the purchase notes to appear. Note that this has to be in the order items table!

<?php
if (!empty($item['product'])) {
    $purchase_note = method_exists($item['product'], 'get_purchase_note') ? $item['product']->get_purchase_note() : $item['product']->purchase_note;
    if ( !empty( $purchase_note ) ) {
        echo wpautop( do_shortcode( wp_kses_post( $purchase_note ) ) );
    }
}
?>

It is also possible to display purchase notes without creating a custom template, by using one the template action hooks (before or after the item meta) and adding it to your themes functions.php:

add_action( 'wpo_wcpdf_after_item_meta', 'wpo_wcpdf_show_purchase_notes', 10, 3 );
function wpo_wcpdf_show_purchase_notes ( $template_type, $item, $order ) {
    if (!empty($item['product'])) {
        $purchase_note = method_exists($item['product'], 'get_purchase_note') ? $item['product']->get_purchase_note() : $item['product']->purchase_note;
        if ( !empty( $purchase_note ) ) {
            echo wpautop( do_shortcode( wp_kses_post( $purchase_note ) ) );
        }
    }
}

or limited to the packing slip:

add_action( 'wpo_wcpdf_after_item_meta', 'wpo_wcpdf_show_purchase_notes', 10, 3 );
function wpo_wcpdf_show_purchase_notes ( $template_type, $item, $order ) {
    if ( $template_type == 'packing-slip' && !empty($item['product']) ) {
        $purchase_note = method_exists($item['product'], 'get_purchase_note') ? $item['product']->get_purchase_note() : $item['product']->purchase_note;
        if ( !empty( $purchase_note ) ) {
            echo wpautop( do_shortcode( wp_kses_post( $purchase_note ) ) );
        }
    }
}