If someone buys a book that you are no longer have or are able to sell, you can cancel the order from the app. Navigate to your "My Sold Books" page in the account tab, click the book in question, and scroll down to where it says "Cancel Order". Make sure to include a message to the buyer explaining why you have to cancel!
Please note that canceling an order to then relist at a higher price is against our Seller Guidelines. To review our seller guidelines, click here.