The ever-cheerful Vijay Shekhar Sharma is definitely the poster boy for digital payments in India. And why not, his company Paytm is the largest player in the payments space. In 2016, when demonetisation sucked cash out of the system, the start-up’s app became the preferred alternative overnight. At least till the government’s great leveler — UPI — started gaining traction. Once this happened, many companies such as Google, PhonePe and various banks set up their own payments solutions using the interface. UPI was now driving digital payments.