Apart from the robust concept and technology, the success of the UPI system rides largely on the government’s 2019 decision to remove the merchant discount rate (MDR), bringing the transaction fee to zero. Union finance minister Nirmala Sitharaman announced that banks—the infrastructure providers—and service provider apps would not charge any fee from users, including commercial players, for transactions via the UPI. However, this has negatively impacted the payment ecosystem, a committee headed by D.B. Pathak, professor emeritus at the Indian Institute of Technology, Bombay, observed, recommending “a lower controlled interchange instead of zero MDR”.