update doc details about order_filled callback details

docs/bot-basics.md

@@ -42,6 +42,8 @@ This will also run the `bot_start()` callback.
 By default, the bot loop runs every few seconds (`internals.process_throttle_secs`) and performs the following actions:
 
 * Fetch open trades from persistence.
+  * Update trades open order state from exchange
+  * Call `order_filled()` stategy callback for filled orders.
 * Calculate current list of tradable pairs.
 * Download OHLCV data for the pairlist including all [informative pairs](strategy-customization.md#get-data-for-non-tradeable-pairs)  
   This step is only executed once per Candle to avoid unnecessary network traffic.
@@ -86,8 +88,10 @@ This loop will be repeated again and again until the bot is stopped.
   * In Margin and Futures mode, `leverage()` strategy callback is called to determine the desired leverage.
   * Determine stake size by calling the `custom_stake_amount()` callback.
   * Check position adjustments for open trades if enabled and call `adjust_trade_position()` to determine if an additional order is requested.
+  * Call `order_filled()` stategy callback for filled entry orders.
   * Call `custom_stoploss()` and `custom_exit()` to find custom exit points.
   * For exits based on exit-signal, custom-exit and partial exits: Call `custom_exit_price()` to determine exit price (Prices are moved to be within the closing candle).
+  * Call `order_filled()` stategy callback for filled exit orders.
 * Generate backtest report output
 
 !!! Note

docs/strategy-callbacks.md

@@ -19,6 +19,7 @@ Currently available callbacks:
 * [`adjust_trade_position()`](#adjust-trade-position)
 * [`adjust_entry_price()`](#adjust-entry-price)
 * [`leverage()`](#leverage-callback)
+* [`order_filled()`](#oder-filled-callback)
 
 !!! Tip "Callback calling sequence"
     You can find the callback calling sequence in [bot-basics](bot-basics.md#bot-execution-logic)
@@ -1022,3 +1023,30 @@ class AwesomeStrategy(IStrategy):
 
 All profit calculations include leverage. Stoploss / ROI also include leverage in their calculation.
 Defining a stoploss of 10% at 10x leverage would trigger the stoploss with a 1% move to the downside.
+
+## Order filled Callback
+
+The `order_filled()` callback may be used by strategy developer to perform specific actions based on current trade state after an order is filled.
+
+Assuming that your strategy need to store the high value of the candle at trade entry, this is possible with this callback as the following exemple show.
+
+``` python
+class AwesomeStrategy(IStrategy):
+    def order_filled(self, pair: str, trade: Trade, order: Order, current_time: datetime, **kwargs) -> None:
+        """
+        Called just ofter order filling
+        :param pair: Pair for trade that's just exited.
+        :param trade: trade object.
+        :param current_time: datetime object, containing the current datetime
+        :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+        """
+        # Obtain pair dataframe (just to show how to access it)
+        dataframe, _ = self.dp.get_analyzed_dataframe(trade.pair, self.timeframe)
+        last_candle = dataframe.iloc[-1].squeeze()
+        
+        if (trade.nr_of_successful_entries == 1) and (order.ft_order_side == trade.entry_side):
+            trade.set_custom_data(key='entry_candle_high', value=last_candle['high'])
+
+        return None
+
+```