curl --request GET \
  --url https://sandbox.withclasp.com/open_enrollment_windows \
  --header 'Authorization: Bearer <token>'

{
  "next": "<string>",
  "previous": "<string>",
  "results": [
    {
      "id": "<string>",
      "employer": "<string>",
      "start_date": "2023-12-25",
      "end_date": "2023-12-25",
      "renewal_date": "2023-12-25",
      "completed_at": "2023-11-07T05:31:56Z",
      "completed_member_count": 123,
      "incomplete_member_count": 123,
      "summaries": [
        {}
      ],
      "plans": [
        "<string>"
      ],
      "metadata": {}
    }
  ]
}