Gone from 5 stars to 1 star! All used to work fine. Now 2 step SMS verification doesn't work on payments. I can receive and input the SMS code but continually get the same error message (Send Failed - The Transaction Fee Has Expired). Same happens on pc/web browser. Spoke to support and chap had no clue what the problem was. In the end I changed my 2 step verification from SMS to Authenticator app... and that change is now preventing me from making payments for 24 hours. That's a massive prob!