curl --request POST \
  --url https://api.example.com/admin/ism-list/style/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "ismListID": 1234,
  "shouldShowIsmPreview": null,
  "styleCodeEntries": [
    {
      "elementTypeCode": "<string>",
      "styleTypeCode": "<string>",
      "positionTypeCode": "<string>",
      "value": "<string>"
    }
  ]
}
'

{
  "success": true,
  "data": "<unknown>"
}