Update app.py

app.py

@@ -1008,7 +1008,7 @@ def checkout():
     try:
         # Fetch the selected coupon (if any)
         data = request.json
-        selected_coupon = data.get("selectedCoupon", "").strip()  # Get selected coupon
+        selected_coupon = data.get("selectedCoupon", "").strip() if data.get("selectedCoupon") else None
         print(f"Selected Coupon: {selected_coupon}")  # Debugging selected coupon
 
         # Fetch cart items for the current user