What if I cannot honor the CancelRequest? What if the order is already far enough along in the shipping process that I cannot cancel it?
That is fine. Just send us the Fulfillment Notice with a status of Shipped, as you normally would for a shipped order. In this scenario, there is no need to actively deny a Cancel Request; if we recieve a Fulfillment Notice with a status of Shipped, we assume that you were not able to cancel the order or part of order.