diff --git a/Source/Runtime/Stubs/UdonProductStub.cs b/Source/Runtime/Stubs/UdonProductStub.cs
index 5a2fd57..e451f97 100644
--- a/Source/Runtime/Stubs/UdonProductStub.cs
+++ b/Source/Runtime/Stubs/UdonProductStub.cs
@@ -35,6 +35,17 @@ public Task<bool> Delete()
             throw new NotImplementedException();
         }
 
+        public Task<IProduct[]> Purchase(
+            string variantID = null, 
+            int totalPrice = 0, 
+            int quantity = -1,
+            Action onPurchaseSuccess = null,
+            Action<string> onPurchaseError = null,
+            bool localInstance = false)
+        {
+            throw new NotImplementedException();
+        }
+
         public Task<IProduct[]> Purchase(
             string variantID = null, 
             int totalPrice = 0, 
diff --git a/Source/Runtime/System/ClientSimUdonManager.cs b/Source/Runtime/System/ClientSimUdonManager.cs
index 21f12a3..5a1a5d9 100644
--- a/Source/Runtime/System/ClientSimUdonManager.cs
+++ b/Source/Runtime/System/ClientSimUdonManager.cs
@@ -130,7 +130,7 @@ public IEnumerator OnClientSimReady()
         private void OnPlayerJoined(ClientSimOnPlayerJoinedEvent joinEvent)
         {
             _udonEventSender.RunEvent(UdonManager.UDON_EVENT_ONINPUTMETHODCHANGED, ("inputMethod", VRCInputMethod.Keyboard));
-            _udonEventSender.RunEvent(UdonManager.UDON_EVENT_ONLANGUAGECHANGED, ("language", ClientSimSettings.Instance.currentLanguage));
+            _udonEventSender.RunEvent("_onLanguageChanged", ("language", ClientSimSettings.Instance.currentLanguage));
             _udonEventSender.RunEvent("_onPlayerJoined", ("player", joinEvent.player));
         }
 
@@ -151,7 +151,7 @@ private void OnScreenUpdate(ClientSimScreenUpdateEvent screenUpdateEvent)
 
         private void OnVRCPlusMassGift(ClientSimOnVRCPlusMassGift giftEvent)
         {
-            _udonEventSender.RunEvent(UdonManager.UDON_EVENT_ONVRCPLUSMASSGIFT, 
+            _udonEventSender.RunEvent("_onVRCPlusMassGift", 
                 ("gifter", giftEvent.gifter),
                 ("numGifts", giftEvent.numGifts));
         }
@@ -172,4 +172,4 @@ public void RemoveUdonBehaviour(UdonBehaviour udonBehaviour)
 
         #endregion
     }
-}
\ No newline at end of file
+}