curl --request PUT \
  --url https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "supportedCarrierList": [
    {
      "carrierId": "C102",
      "displayName": "Deutsche Post"
    }
  ]
}
'

{
  "errorList": [
    {
      "code": "VAL100",
      "message": "Required field sellerId not found",
      "severity": "error",
      "hint": "Check the field `sellerId` — it must be a non-empty string."
    }
  ]
}