PendingOrders.Modified

event Action<PendingOrderModifiedEventArgs> Modified;

api.PendingOrders.Modified += handler  # handler(obj: PendingOrderModifiedEventArgs)

protected override void OnStart()
{
    PendingOrders.Modified += OnPendingOrdersModified;
    var result = PlaceStopOrder(TradeType.Buy, SymbolName, 10000, Symbol.Ask + 10 * Symbol.PipSize);
    if (result.IsSuccessful)
        result.PendingOrder.ModifyTargetPrice(Symbol.Ask + 20 * Symbol.PipSize);
}

private void OnPendingOrdersModified(PendingOrderModifiedEventArgs args)
{
    Print("Pending order with id {0} was modified, new target price {1}", args.PendingOrder.Id, args.PendingOrder.TargetPrice);
}

def on_start(self):
    api.PendingOrders.Modified += self.on_pending_orders_modified
    result = api.PlaceStopOrder(TradeType.Buy, api.SymbolName, 10000, api.Symbol.Ask + 10 * api.Symbol.PipSize)
    if result.IsSuccessful:
        result.PendingOrder.ModifyTargetPrice(api.Symbol.Ask + 20 * api.Symbol.PipSize)

def on_pending_orders_modified(self, args):
    api.Print(f"Pending order with id {args.PendingOrder.Id} was modified, new target price {args.PendingOrder.TargetPrice}")