curl --request GET \
  --url https://api.hubapi.com/webhooks/v3/{appId}/subscriptions \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "active": true,
      "createdAt": "2019-10-30T03:30:17.883Z",
      "eventType": "contact.propertyChange",
      "id": "12",
      "propertyName": "email",
      "updatedAt": "2019-11-30T03:30:17.883Z"
    },
    {
      "active": true,
      "createdAt": "2019-10-30T03:30:17.883Z",
      "eventType": "deal.creation",
      "id": "13",
      "updatedAt": "2019-11-30T03:30:17.883Z"
    }
  ]
}