Fetch topic

curl --request GET \
  --url https://app.getcensus.com/api/v1/sources/{source_id}/topics/{topic_id} \
  --header 'Authorization: Bearer <token>'

{
  "status": "success",
  "data": {
    "id": 18,
    "name": "NewAppUsers",
    "description": "Users that have signed up for our product in the last week.",
    "created_at": "2021-10-20T02:43:07.120Z",
    "updated_at": "2021-10-20T02:50:35.477Z",
    "schema": {
      "name": "string",
      "id": "number",
      "email": "string"
    }
  }
}