Any legitimate casino that's licensed will pay out real money provided of course that you win. As long as you haven't contravened any terms and conditions, you can request a withdrawal and the casino will be compelled to honour it by law. There used to be quite a bit of jiggery pokery among casinos when it came to paying out. But the introduction of stricter gambling regulations and the increasing influence of the Gambling Commission means that, in the vast majority of cases, the casino will play ball.