Then again these days there are only a few big POS providers that merchants use, you'd have to get the POS providers to accept your payment method and that would be a huge win.
So sure, there are a few bigger providers but a lot of POS systems (not all) are in it for the CC fees (they want a cut) which means they work closely with MC/Visa/etc, how do you think the existing CC companies will respond to a POS working to help dethrone them? And what’s in it for the POS company?