Add stop_price_type support (futures only!).

freqtrade/exchange/okx.py

@@ -5,6 +5,7 @@ import ccxt
 
 from freqtrade.constants import BuySell
 from freqtrade.enums import CandleType, MarginMode, TradingMode
+from freqtrade.enums.pricetype import PriceType
 from freqtrade.exceptions import DDosProtection, OperationalException, TemporaryError
 from freqtrade.exchange import Exchange, date_minus_candles
 from freqtrade.exchange.common import retrier
@@ -27,6 +28,12 @@ class Okx(Exchange):
     _ft_has_futures: Dict = {
         "tickers_have_quoteVolume": False,
         "fee_cost_in_contracts": True,
+        "stop_price_type_field": "tpTriggerPxType",
+        "stop_price_type_value_mapping": {
+            PriceType.LAST: "last",
+            PriceType.MARK: "index",
+            PriceType.INDEX: "mark",
+            },
     }
 
     _supported_trading_mode_margin_pairs: List[Tuple[TradingMode, MarginMode]] = [