MyCourier calls your server each time the status of one of your orders changes, whether the order came from the API, the portal or a file import. You build this endpoint and give its address to MyCourier.Reply. Any 2xx answer within 10 seconds counts as delivered.Retries. No answer, a timeout, 5xx, 408 and 429 are tried again later, for up to 24 hours. Any other 4xx is not tried again. A repeat carries the same eventId, so keep the ids you have handled and ignore duplicates.Address. It must be a public HTTPS address.Requests carry Content-Type: application/json, User-Agent: MyCourier-Webhook/1.0 and X-MyCourier-Event-Id (the same value as eventId). The calls are not signed, so use an address that is hard to guess and check the tracking number against your own orders.