Sub-Task record

{
  "subtask": {
    "id": 290,
    "task_id": 324,
    "user_id":453,
    "text": "Sub-task title",
    "done": true, 
    "order": 2,
    "task": <task_record>,
    "user": <user_record>
  }

For more information, see user record, task record