WooCommerce: Get item info from refunds

wc-refund-item-info.php

<?php
// Get items from all refunds
$refunds      = array();
$refund_items = get_posts( array(
	'post_type'      => 'shop_order_refund',
	'posts_per_page' => -1,
	'post_status'    => 'any',
	'fields'         => 'ids'
) );

foreach ( $refund_items as $refund_id ) {
	$refund = new WC_Order_Refund( $refund_id );
	// All items for the order are returned in the Refund object
	// but you can pull each out based on quantity
	//error_log( print_r ( $refund->get_items(), 1 ) );
}

// Get all items from a specific refund
$refund_items = get_posts( array(
	'post_type'   => 'shop_order_refund',
	'post_parent' => 513, // order ID
	'post_status' => 'any',
) );

foreach ( $refund_items as $refund_id ) {
	$refund = new WC_Order_Refund( $refund_id );
	error_log( print_r ( $refund->get_items(), 1 ) );
}