curl --request POST \
  --url https://sandbox.api.fantasyfutbol.app/v1/mini-league \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "fantasy_league_id": 2,
  "name": "<string>",
  "type": "classic"
}
'

{
  "statusCode": 123,
  "message": "<string>",
  "data": {
    "id": 123,
    "name": "<string>",
    "rank_system": "<string>",
    "total_squads": 123,
    "code": "<string>",
    "is_open": true,
    "is_active": true,
    "start_game_week": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "week": "<string>",
      "start_date": "2023-11-07T05:31:56Z",
      "end_date": "2023-11-07T05:31:56Z"
    },
    "fantasy_league": {
      "id": 123,
      "name": "<string>"
    },
    "rank_updated_at": "2023-11-07T05:31:56Z",
    "style": "<string>",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}