I am based in India and we have taken to this in a BIG way. The Govt has put in a massive effort to build an open payment platform over the last couple of years which a lot of startups have used to gain traction amongst users and small business owners.

Buying groceries from the local "kirana" shops to paying for a short tuktuk ride are all possible with a quick QR scan, instead of card swipes or haggling with cash and change!