curl --request POST \
  --url https://api.example.com/api/v1/execution/orders/{clientOrderId}/cancel

{
  "code": 0,
  "msg": "ok",
  "data": {
    "clientOrderId": "ord_20260511_0001",
    "exchangeOrderId": "789123456",
    "exchange": "binance",
    "symbol": "BTCUSDT",
    "status": "new"
  }
}