Get categories

Example response

{
  "categories": [
    {
      "analytics_group": "revenue",
      "created": "2026-07-23T19:53:47.330337+00:00",
      "description": "Rent for offices, workspaces or storage facilities",
      "heron_id": "ctg_5YuNdaG2cyxnq4mZnxq8n9",
      "label": "Rent"
    }
  ]
}