The cancellation is processed asynchronously: the request is accepted and the cancellation is completed in the background.. The final outcome (success or failure) is delivered via the route.canceled webhook, so a subscription to that event is required. If the route is in draft state, its orders are unlinked from the route (leaving the orders intact and free to be added to other routes) and the route is canceled. If the route has not started, cancellation is allowed and applied to all orders under it. If any order is in progress, cancellation is not allowed.