delete
https://trade-hk.oslsandbox.com/api/v4/order/all
Send cancel requests to all open orders owned by the user. The difference between this endpoint (DELETE /order/all) and DELETE /order end point is that DELETE /order/all is executed as one transaction by the engine, while the DELETE /order is executed as multiple transactions if you intend to bulk cancelling more than one order.
To call this endpoint, the API Key need to have thePlace and Manage Orderspermission enabled (via OSL website).
