curl --request GET \
  --url https://api.hubapi.com/scheduler/v3/meetings/meeting-links/book/availability-page/{slug} \
  --header 'Authorization: Bearer <token>'

{
  "allUsersBusyTimes": [
    {
      "busyTimes": [
        {
          "end": 123,
          "start": 123
        }
      ],
      "isOffline": true,
      "meetingsUser": {
        "calendarProvider": "EXCHANGE",
        "id": "<string>",
        "isSalesStarter": true,
        "userId": "<string>",
        "userProfile": {
          "email": "<string>",
          "firstName": "<string>",
          "fullName": "<string>",
          "lastName": "<string>"
        }
      }
    }
  ]
}