Replaces the complete shipping configuration of an externally shipped order (i.e. orders created with shipping.isExternal: true), e.g. when the courier is booked after the order was created. Send the complete current configuration on every request: all omitted fields are cleared, including pickup and return codes, tracking, and pickup time. An empty object clears all shipping details. Unknown fields are rejected. The pharmacy sees the new details in the order. If pickupVerificationCode changes or is removed after the pharmacy printed the shipping label, the order history asks the pharmacy to print the label again. Without a pickup code the label QR contains the order ID. Send the pickup code with POST /prescriptions/paid when known, and include it in every replacement that should retain it. Emails already sent to the patient are not sent again. Allowed until the order is completed or canceled. Active labels are reconciled to the snapshot; repeating an already synchronized snapshot records no additional event.