Practitioners are able to cancel an order up until any item in the order is fulfilled. Practitioners can do this in their account, by locating the order in Order History and choosing cancel from the Action List next to the order. This option disappears once fulfillment begins (not finished).
The admin can cancel an order by changing the status to “Cancelled.” This will trigger an email to the practitioner notifying them that the order was cancelled. You can modify this email and all emails in Notification Settings.