curl --request GET \
  --url https://api.hubapi.com/marketing/v3/marketing-events/events/search \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "externalAccountId": "<string>",
      "externalEventId": "<string>",
      "appId": 123,
      "objectId": "<string>"
    }
  ]
}