curl --request POST \
  --url https://sandbox.withclasp.com/group_connections \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "carrier": "<string>",
  "broker_federal_ein": "<string>",
  "group_id": "<string>",
  "connection": "<string>"
}'

{
  "id": "<string>",
  "carrier": "<string>",
  "status": "pending",
  "broker_federal_ein": "<string>",
  "group_id": "<string>",
  "connection": "<string>",
  "initiated_at": "2023-11-07T05:31:56Z",
  "completed_at": "2023-11-07T05:31:56Z"
}