curl -H "X-API-Key: $PARTICLE_API_KEY" \
  "https://api.particle.pro/v1/topics/{id}"

{
  "id": "<string>",
  "name": "<string>",
  "slug": "<string>",
  "total_children": 123,
  "ancestors": [
    "<string>"
  ],
  "ancestry": "<string>",
  "ancestry_path": "<string>",
  "children": [
    {
      "id": "<string>",
      "name": "<string>",
      "slug": "<string>",
      "ancestry": "<string>",
      "ancestry_path": "<string>",
      "episode_count": 123
    }
  ],
  "episode_count": 123
}

{
  "detail": "<string>",
  "error_code": "<string>",
  "errors": [
    {
      "location": "<string>",
      "message": "<string>",
      "value": "<unknown>"
    }
  ],
  "instance": "<string>",
  "resolve": {
    "message": "<string>",
    "action": "<string>",
    "endpoint": "<string>",
    "method": "<string>",
    "url": "<string>"
  },
  "status": 123,
  "title": "<string>",
  "type": "about:blank"
}