This will not work if it has already been paid. It is recommended that you immediately remove the incorrectly priced item from the shelves. Buyers who have already paid should negotiate with them first. Give him something small. If it doesn't work, just ship it to him at a loss. If payment has not been made, you can cancel unilaterally. Note that if it is from Taobao, you can only cancel it unilaterally. If it is from Tmall, you will be complained, and it will definitely be established. Negotiation is still the main thing now, and most buyers will agree.