Update app.py

app.py

@@ -121,11 +121,26 @@ def fetch_latest_incoming_message(account_sid, auth_token, conversation_sid):
 def send_twilio_message(account_sid, auth_token, conversation_sid, body):
     try:
         client = Client(account_sid, auth_token)
-        message = client.conversations.v1.conversations(conversation_sid).messages.create(author="system", body=body)
+        # Get participants to find the bot's WhatsApp identity
+        participants = client.conversations.v1.conversations(conversation_sid).participants.list()
+        # Pick the first participant whose identity starts with 'whatsapp:'
+        bot_identity = None
+        for p in participants:
+            if p.identity.startswith("whatsapp:"):
+                bot_identity = p.identity
+                break
+        if not bot_identity:
+            return "⚠️ Bot identity with whatsapp: prefix not found in participants."
+
+        message = client.conversations.v1.conversations(conversation_sid).messages.create(
+            author=bot_identity,
+            body=body
+        )
         return message.sid
     except Exception as e:
         return str(e)
 
+
 # --- Streamlit UI ---
 st.set_page_config(page_title="Quasa – A Smart WhatsApp Chatbot", layout="wide")