Since refunds aren't issued until requested by the buyer, communication is key. So, if you need additional time, you can select the Delayed Shipment option under the Problems/Order Inquiry tab on the Order Detail screen (see image below). This will generate a pre-populated message to the buyer (you can modify this message) informing him/her that you need more time. In most cases, buyers are fine with the delay so long as they are aware of the situation. However, if the purchase is time sensitive, they may choose to request a refund.