Hi,I know with Simple delivery that if you have under calculated your postage cost on an item Ebay will deduct the extra from the sale of the item . BUT what happens if you have over calculated the postage cost ,do Ebay refund that extra amount to you. Thank you Tim

When you use Simple Delivery, you don't choose or set the postage cost. Ebay calculates the cost based on the size and weight of the item which you select as you list.