public function get_qty_refunded_for_item($item_id, $item_type = 'line_item')
{
$qty = 0;
foreach ($this->get_refunds() as $refund) {
foreach ($refund->get_items($item_type) as $refunded_item) {
if (absint($refunded_item->get_meta('_refunded_item_id')) === $item_id) {
$qty += $refunded_item->get_quantity();
}
}
}
return $qty;
}