curl --request POST \
  --url http://localhost/api/schedules/{schedule}/updates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "message": "<string>"
}
'

{
  "data": {
    "id": "<string>",
    "attributes": {
      "id": 123,
      "updateable_id": 123,
      "updateable_type": "<string>",
      "message": "<string>",
      "created": {
        "human": "<string>",
        "string": "<string>"
      },
      "updated": {
        "human": "<string>",
        "string": "<string>"
      },
      "status": {
        "human": "<string>",
        "value": "<string>"
      }
    }
  }
}