Well no, not really. How do you know a user has paid? Sure there might be a 1BTC transaction in the last 5 minutes, but is it the user who has just paid or some

Well no, not really. How do you know a user has paid? Sure there might be a 1BTC transaction in the last 5 minutes, but is it the user who has just paid or somebody else who hasn't contacted you yet? Such simple issues are made simple by just using Bitcoin the way it was intended.