curl --request GET \
  --url https://api.hubapi.com/communication-preferences/v4/statuses/{subscriberIdString}/unsubscribe-all \
  --header 'Authorization: Bearer <token>'

{
  "completedAt": "2023-11-07T05:31:56Z",
  "numErrors": 123,
  "requestedAt": "2023-11-07T05:31:56Z",
  "startedAt": "2023-11-07T05:31:56Z",
  "links": {},
  "results": [
    {
      "wideStatusType": "PORTAL_WIDE",
      "subscriberIdString": "<string>",
      "channel": "EMAIL",
      "businessUnitId": 123,
      "status": "SUBSCRIBED",
      "timestamp": "2023-11-07T05:31:56Z"
    }
  ],
  "errors": [
    {
      "subCategory": "",
      "context": "",
      "links": "",
      "id": "",
      "category": "",
      "message": "",
      "errors": "",
      "status": ""
    }
  ],
  "status": "PENDING"
}