Bartek

Hi!

meta_value is serialized, but when you call get_post_meta assuming that you have an ID of the object (order) for the key you want, you will get returned array.

Now all you have to do is to return value from that array, what would be like:

$payment_meta = get_post_meta( $ID, '_op_payment_methods' );
return $payment_meta['ref'];

Hi!

At first you just have to get WC_Order, what you already did by running $this->get_order(). From now on you need some variable to hold items with quantities. Something like that:

$order_items = $this->get_order()->get_items();
$items_with_quantity = array();
foreach ( $order_items as $item ) {
 if ( $item instanceof \WC_Order_Item_Product ) {
    $item_with_quantity = array();
    $item_with_quantity[] = $item->get_name();
    $item_with_quantity[] = $item->get_quantity();
    $items_with_quantity[] = implode(': ', $item_with_quantity);
  }
}

return implode(', ', $items_with_quantity);