Unified Payments Interface is an Indian instant payment system as well as protocol developed by the National Payments Corporation of India in 2016. The interface facilitates inter-bank peer-to-peer and person-to-merchant transactions. From Wikipedia
Tracing a ₹10,000 UPI payment to Jadavpur enabled police to pinpoint a held trader; autorickshaw CCTV footage led them to a second hostage within hours.
