curl --request GET \
  --url https://api.hubapi.com/webhooks/v3/{appId}/subscriptions

{
  "results": [
    {
      "createdAt": "2023-11-07T05:31:56Z",
      "objectTypeId": "<string>",
      "propertyName": "<string>",
      "active": true,
      "eventType": "contact.propertyChange",
      "id": "<string>",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ]
}