This API enables you (store admin context) to cancel orders in bulk. And, this is secured by x-api-key. Only the order placed with in 24 hours and are not yet shipped can be cancelled. That is, an order can be cancelled only in the following statuses - Order_Payment_Authorized or Order_Created. When all the orders in the request is successfully cancelled, the response includes a list of order IDs along with the status - Successfully cancelled order. If one or more orders in the request couldn't be cancelled, the response will additionally include (error) code and message fields to highlight the error reason.