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

{
  "next": "<string>",
  "previous": "<string>",
  "results": [
    {
      "group_number": "<string>",
      "carrier": "<string>",
      "employer": "<string>",
      "id": "<string>"
    }
  ]
}