{
  "success": true,
  "error": "<string>",
  "callbacks": {
    "id": 123,
    "agent_callback_id": "<string>",
    "display_id": 123,
    "host": "<string>",
    "user": "<string>",
    "description": "<string>",
    "active": true,
    "last_checkin": "<string>"
  }
}

{
  "callback_id": 123,
  "agent_callback_id": "<string>",
  "active": true,
  "host": "<string>",
  "user": "<string>"
}