The correct answer is 2016. In a move that will broaden the scope of digital payments in the country, the Reserve Bank of India (RBI) has allowed credit cards to be linked with the unified payments interface (UPI) for payments. UPI, launched in 2016, has played a pivotal role in transforming the digital economy of the country and has emerged as a favorite digital payment choice by citizens. Going by the RBI data, UPI has over 26 crore unique users and 5 crore merchants. The central bank's data show that 594. 63 crore transactions amounting to Rs 10. 40 lakh crore were processed through UPI in May 2022. Additional Information National Payments Corporation of India. Year of foundation - 2008. Headquarters - Mumbai. The National Payments Corporation of India (NPCI) is an initiative taken by the Reserve Bank of India (RBI) and the Indian Banks Association () to operate the retail payments and settlement systems in India.