Update app.py

app.py

@@ -25,7 +25,7 @@ async def handle_webhook(
 @app.post("/webhooks")
 async def handle_event_notifications(
     request: Request,
-    # x_hub_signature_256: Optional[str] = Header(None)  # Header for signature verification
+    x_hub_signature_256: Optional[str] = Header(None)  # Header for signature verification
 ):
     # # Read and verify the request body
     # body = await request.body()