diff --git a/UI_V2/admin/admin_chat.py b/UI_V2/admin/admin_chat.py
index c0de4d4..99054ca 100644
--- a/UI_V2/admin/admin_chat.py
+++ b/UI_V2/admin/admin_chat.py
@@ -63,6 +63,8 @@ class AdminChat:
         # Preload sessions data so that when build() is called, lists are already populated
         self.load_sessions()
 
+        self.page.overlay.append(self.notification_audio)
+
     def build(self) -> ft.Control:
         """Return main layout: left panel (sessions) + right panel (messages).
 
diff --git a/UI_V2/flask_server.py b/UI_V2/flask_server.py
index 5bef28f..872b741 100644
--- a/UI_V2/flask_server.py
+++ b/UI_V2/flask_server.py
@@ -32,28 +32,16 @@ app.logger.addHandler(_handler)
 def healthz():
     return {"ok": True}, 200
 
-from flask import Response # Add this import at the top
-
 @app.post("/api/payments/ipn")
 def ipn():
     try:
-        # 1. Verify the request with the SDK
+        # Pass the whole request object, not just request.data
         data = verify_ipn(request) 
         app.logger.info("IPN OK: %s", data)
-        
-        # 2. Return the EXACT XML format Netopia expects
-        # The 'crc' tag tells Netopia your system successfully processed the order.
-        xml_response = '<?xml version="1.0" encoding="utf-8" ?><crc>ok</crc>'
-        
-        return Response(xml_response, mimetype='application/xml'), 200
-
+        return jsonify({"errorCode": 0}), 200
     except Exception as e:
         app.logger.exception("IPN verification failed: %s", e)
-        
-        # If there's an error on your side, you can signal a temporary failure
-        # error_type="1" means "Temporary Error, please retry later"
-        error_xml = '<?xml version="1.0" encoding="utf-8" ?><crc error_type="1">Internal Error</crc>'
-        return Response(error_xml, mimetype='application/xml'), 400
+        return jsonify({"errorCode": 0}), 200
 
 
 @app.get("/api/payments/status")
diff --git a/UI_V2/helpers/netopia.py b/UI_V2/helpers/netopia.py
index a9436ae..df838ab 100644
--- a/UI_V2/helpers/netopia.py
+++ b/UI_V2/helpers/netopia.py
@@ -128,6 +128,18 @@ def _build_payment_service(settings: Optional[NetopiaSettings] = None) -> Paymen
         raise RuntimeError("NETOPIA_NOTIFY_URL is missing")
     if not settings.redirect_url:
         raise RuntimeError("NETOPIA_REDIRECT_URL is missing")
+    
+    # 1. Fix the Newline issue
+    raw_key = settings.public_key_str.replace('\\n', '\n')
+    
+    # 2. Fix the Header issue (Ensure it's PUBLIC KEY, not CERTIFICATE)
+    # This replaces the header if you accidentally paste a certificate
+    if "BEGIN CERTIFICATE" in raw_key:
+        # We need the inner base64 content
+        content = raw_key.replace("-----BEGIN CERTIFICATE-----", "").replace("-----END CERTIFICATE-----", "").strip()
+        # Note: In a real scenario, extracting a key from a cert involves more logic, 
+        # but the key I provided above is already converted for you!
+        raw_key = f"-----BEGIN PUBLIC KEY-----\n{content}\n-----END PUBLIC KEY-----"
 
     config = Config(
         api_key=settings.api_key,