Available to: companies, portals, partners

Example payload:

{
  "created_at": "2019-09-18T18:08:22+00:00",
  "data": {
    "object": {
      "body": "Submission body",
      "created_at": "2020-05-08T13:19:21+00:00",
      "id": "WONjpK2O",
      "submittable_id": "WONjpK2O",
      "submittable_type": "Milestone",
      "team_id": "WONjpK2O",
      "updated_at": "2020-05-08T13:19:21+00:00"
    },
    "previous_attributes": {
      "foo": "baz"
    }
  },
  "id": "123ABC",
  "type": "submission.updated"
}