{
  "id": "...",
  "event": "sample",
  "transform_job_id": "...",
  "silo_entry_id": "..."
}

The event field is optional and will be included only if you configure it.

Returning anything other than a 200 or 204 HTTP status code will register an error and record the message field from a JSON response.

The retry_in property if included in a JSON response body will cause a new request to wait at least the amount of time provided in seconds.