This endpoint would be used by the Kiosk via short-polling to see if the order confirmation QR code has been scanned yet, so it knows when to auto-dismiss the prompt for the patron to scan the QR code.
Once the tracking event expiry (of 10 minutes) elapses this endpoint will no longer retain a record of this event and will continue returning Microsoft.AspNetCore.Http.StatusCodes.Status202Accepted again, as if the event was not set.
Completed order link opened event not found, client can keep polling.
Completed order link has been opened, client can auto-dismiss the prompt to scan the QR code.