curl --request GET \
  --url 'https://api.peoplewisher.com/v1/celebration-groups' \
  --header 'Authorization: Bearer YOUR_API_KEY' 

{
  "success": true,
  "data": [
    {
      "group_id": 24,
      "name": "Customers",
      "category": "birthday",
      "status": "active",
      "date_created": "2026-09-28 16:00:00",
      "data_source_id": null,
      "data_source_name": null,
      "data_source_type": null,
      "contact_count": 174
    },
    {
      "group_id": 25,
      "name": "Work Anniversaries",
      "category": "work_anniversary",
      "status": "active",
      "date_created": "2026-09-28 16:02:00",
      "data_source_id": null,
      "data_source_name": null,
      "data_source_type": null,
      "contact_count": 42
    }
  ]
}