woocommerce-order-item-meta-hooks.php

<?php
/***********************************************************************************
These are examples and references for the WooCommerce Order Item meta data hooks 
that is displayed in the admin side of WordPress when viewing a customer's order.
***********************************************************************************/

//Do Something before the order item's meta data
do_action( 'woocommerce_before_order_itemmeta', $item_id, $item, $_product );

//Do Something after the order item's meta data
do_action( 'woocommerce_after_order_itemmeta', $item_id, $item, $_product );



//Display a message above the item meta data
function display_message_above() {
  echo '<p>Here is my content above the item meta data!</p>';
}
add_filter( 'woocommerce_hidden_order_itemmeta', 'display_message_above' );

//Display a message below the item meta data
function display_message_below() {
  echo '<p>Here is my content below the item meta data!</p>';
}
add_filter( 'woocommerce_hidden_order_itemmeta', 'display_message_below' );