XTB API JSON cannot modify existing trade position

Question

I am using a xAPI Playground for testing, link here: https://playground.xapi.pro/ I want to edit/modify existing position with command: tradeTransaction. Documentation says to modify existing position I should use "type" as 3 and "cmd" should match existing position (0 for BUY and 1 for SELL)

{
    "command": "tradeTransaction",
    "arguments": {
        "tradeTransInfo": {
            "cmd": 1,
            "customComment": "Some text",
            "expiration": 0,
            "order": order_number_as_int ,
            "price": open_price_as_double,
            "sl": my_double_value,
            "tp": my_another_double_value,
            "symbol": "f.e. OIL.WTI",
            "type": 3,
            "volume": 0.01
        }
    }
}

Error code

{
    "status": false,
    "errorCode": "SE199",
    "errorDescr": "Internal error"
}

All possible data collected from API about existing position:

{'cmd': 1, 'order': 474325736, 'digits': 2, 'offset': 0, 'order2': 474325838, 'position': 474325736, 'symbol': 'OIL.WTI', 'comment': '', 'customComment': '', 'commission': 0.0, 'storage': 0.0, 'margin_rate': 0.0, 'close_price': 76.65, 'open_price': 76.57, 'nominalValue': 0.0, 'profit': -3.56, 'volume': 0.01, 'sl': 80.0, 'tp': 70.0, 'closed': False, 'timestamp': 1676665564666, 'spread': 0, 'taxes': 0.0, 'open_time': 1676663063081, 'open_timeString': 'Fri Feb 17 20:44:23 CET 2023', 'close_time': None, 'close_timeString': None, 'expiration': None, 'expirationString': None},

API documentation is here: http://developers.xstore.pro/documentation/#tradeTransaction

Of course I tried every possible value in "cmd" and "type" but it does not help. Error code sometimes are different, for example:

{
    "command": "tradeTransaction",
    "arguments": {
        "tradeTransInfo": {
            "cmd": 3,
            "customComment": "Some text",
            "expiration": 0,
            "order": 474325838,
            "price": 0,
            "sl": 0,
            "tp": 0,
            "symbol": "OIL.WTI",
            "type": 3,
            "volume": 0.01
        }
    }
}

Error code:

{
    "status": false,
    "errorCode": "BE4",
    "errorDescr": "remaining nominal must be greater than zero"
}

Any ideas what I can do wrong? I am in touch with XTB support, still waiting for response.

Answer 1

Simply use on "cmd" and "type" 0.

Order, open price and symbol must be filled correctly.

XTB support does not see any issue, they tried with "cmd" and "type" 3 and for them it worked fine.

Answer 2

Use getTrades to see your position ID It's different from your order ID but has the same number of digits.

Use position ID instead of order ID in your command.

EDIT : It's a bit more complicated but here's the point :

XTB App gives you Order ID and Position ID. You must use Position ID to close the order.

And for the API :

tradeTransaction response gives you the 'order' field - you can't use this one to close order

BUT

getTrades gives you 3 fields : 'order', 'order2' and 'position'.

'order' seems to be the same as 'position' - which you can use to close you order

'order2' seems to be the same as tradeTransaction's 'order' - once again you can't use this one.