Creating / updating listings merchant_shipping_group

[TechyChap]

We are trying to work out how to set the merchant_shipping_group for a listing. This seems to be an internal code, so we are not sure how to read back the list of valid enumerations. Has anyone managed to do this?

    "merchant_shipping_group": [
        {
            "value": "cbc65473-01dd-4918-9d73-3f3b88ee1f1e",
            "marketplace_id": "A1F83G8C2ARO7P"
        }
    ],