I would have rated 5 star but of my recent worst experience with the app I am doing this ..during the Dubai super meet the QR codes were given but whenever I scanned them my app got crashed it was untill the last day at last I was able to claim 1 by scanning but in user centre later I couldn't see the mystery box that was the time I saw that not everything Is perfect being the worlds largest exchange it also had many errors, limitations and frauds