this is dope, and also something I have been working on on android (yes I am gonna be that guy, Android has supported this for a long time)... it's great for informal merchants, and maybe waiters that run around a bar collecting bills from customers... but actual POS devices aren't going anywhere, there is always gonna be a need for them, this function has been there and even has a name (softPos) many companies can give you this functionality TODAY on your android phone, so yes apple devices can now participate but it won't shake the market as everyone thinks.