POST /duel/solana/join

{
  "duel": {
    "answer": 0,
    "duel_id": "string",
    "external_source": "string",
    "invited_by": "string",
    "paid_price": 0
  },
  "tx_hash": "string"
}

{
  "player": {
    "answer": 0,
    "created_at": "string",
    "duel_id": "string",
    "final_status": 0,
    "id": "string",
    "is_winner": true,
    "paid_price": 0,
    "user_id": "string",
    "win_amount": 0
  },
  "result": {
    "tx_hash": "string"
  }
}

{
  "message": "string",
  "status": 0
}

{
  "message": "string",
  "status": 0
}

{
  "message": "string",
  "status": 0
}