Update "exchange_has" validation with new fallbacks

freqtrade/exchange/common.py

@@ -60,16 +60,17 @@ SUPPORTED_EXCHANGES = [
     'okx',
 ]
 
-EXCHANGE_HAS_REQUIRED = [
+# either the main, or replacement methods (array) is required
+EXCHANGE_HAS_REQUIRED = {
     # Required / private
-    'fetchOrder',
-    'cancelOrder',
-    'createOrder',
-    'fetchBalance',
+    'fetchOrder': ['fetchOpenOrder', 'fetchClosedOrder'],
+    'cancelOrder': [],
+    'createOrder': [],
+    'fetchBalance': [],
 
     # Public endpoints
-    'fetchOHLCV',
-]
+    'fetchOHLCV': [],
+}
 
 EXCHANGE_HAS_OPTIONAL = [
     # Private

freqtrade/exchange/exchange_utils.py

@@ -49,7 +49,11 @@ def validate_exchange(exchange: str) -> Tuple[bool, str]:
     reason = ''
     if not ex_mod or not ex_mod.has:
         return False, ''
-    missing = [k for k in EXCHANGE_HAS_REQUIRED if ex_mod.has.get(k) is not True]
+    missing = [
+        k for k, v in EXCHANGE_HAS_REQUIRED.items()
+        if ex_mod.has.get(k) is not True
+        and not (all(ex_mod.has.get(x) for x in v))
+    ]
     if missing:
         result = False
         reason += f"missing: {', '.join(missing)}"