many change

order.py

@@ -81,22 +81,22 @@ class OrderManager:
         self._send_timestamps.append(now)
         return True
 
-    def sell(self, symbol: str, dir: Dir, price: int, size: int):
+    def sell(self, symbol: str, price: int, size: int):
         return self._attempt_send(
             "add",
             order_id=self.next_order(),
             symbol=symbol,
-            dir=dir,
+            dir=Dir.SELL,
             price=price,
             size=size,
         )
 
-    def buy(self, symbol: str, dir: Dir, price: int, size: int):
+    def buy(self, symbol: str, price: int, size: int):
         return self._attempt_send(
             "add",
             order_id=self.next_order(),
             symbol=symbol,
-            dir=dir,
+            dir=Dir.BUY,
             price=price,
             size=size,
         )