This was a great article - the only thing I would add is a note about the conditions under which shipping will be refunded or return shipping will be provided. I always pay shipping both ways if an item is defective, damaged, or the wrong item was shipped. I think letting the customer know they won't be out the shipping costs if there is a mistake on my part or if the item is damaged or defective is important. I also spell out that if they change their mind about an order, they are responsible for all shipping costs.