ORDER-222 - Update custom fields on a commercial order

PUT https://example.com/v2/shop/commercial-orders/{commercialOrderId}

Updates the list of custom fields for a commercial order.

⚠️ This endpoint can only be used if all underlying logistic orders of the commercial order are in DRAFT_ORDER status.
Note: The commercial order itself does not have a status — only its associated logistic orders do.

Custom fields can be identified by DJUST_ID or EXTERNAL_ID. If no type is provided, EXTERNAL_ID is assumed.

This route is often used to replace the cart name with a proper custom field value during order construction.

Permissions: Requires a valid API key and client type.

Multistore Support: Optional store view context header allows routing in multistore environments.