curl --request GET \
  --url https://api.hubapi.com/crm/properties/2025-09/{objectType}/groups \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "displayOrder": -1,
      "label": "My Property Group",
      "name": "mypropertygroup"
    }
  ],
  "paging": {
    "next": {
      "after": "<string>",
      "link": "<string>"
    },
    "prev": {
      "before": "<string>",
      "link": "<string>"
    }
  }
}