Unified Payments Interface (UPI)

The Unified Payments Interface, commonly abbreviated UPI, is a payment system developed by the National Payments Corporation of India (NPCI), an organization regulated by the Reserve Bank of India (RBI). NPCI states that UPI's pilot launch took place on 11 April 2016. The RBI's Annual Report likewise identifies UPI as launched in 2016. The system links banks, payment service providers, apps, users and merchants so that participating services can initiate and receive payments through a shared framework.

A UPI application can allow a user to link multiple participating bank accounts. Payments are routed through the participating institutions using a UPI address or other supported payment details, without requiring the payer to enter the recipient's bank account number and branch code for every transaction. NPCI describes UPI as supporting both person-to-person transfers and merchant payments. It also supports QR-code and intent-based payments, allowing a user to initiate a payment by scanning a merchant's code or following a payment request in a supported app.

UPI is designed to work across participating banks and apps, so users can send a payment from one UPI app to a recipient using another participating app. NPCI describes fund transfers as available immediately through mobile devices around the clock, including on all days of the year. This availability distinguishes the payment experience from systems dependent on a bank's branch hours, although transaction completion still depends on the participating institutions and service conditions.

NPCI's description of UPI emphasizes two-factor authentication and the use of a virtual payment address to avoid sharing bank-account details for each transfer. Its current product information describes authentication using a mobile number linked to the user's bank and a UPI PIN. Users should enter their PIN only in the trusted payment app to authorize a transaction, and should not disclose it to anyone claiming to help receive money. The RBI's reporting situates UPI's growth within a broader payment ecosystem where safety, security and consumer protection remain regulatory concerns.

UPI supports transfers between individuals as well as payments to merchants. NPCI lists features and services that extend the basic system, including QR payments, UPI AutoPay for recurring payments, UPI Lite for certain small-value uses, and UPI 123PAY for feature-phone users. These are related extensions and product features, not separate names for the core UPI system. The RBI has also described work linking UPI with other countries' fast-payment systems, including the UPI–PayNow linkage between India and Singapore, as part of efforts to improve cross-border payments.

The RBI's Annual Report describes UPI as the most-used and preferred payment channel in India's payment landscape and reports that it processes more than 16 billion transactions per month in the report's period. It notes that UPI brings multiple bank accounts together in one mobile interface and has developed with features such as UPI Lite, UPI Lite X and UPI 123PAY. Because transaction statistics change over time, current volumes should be checked against NPCI's published product statistics rather than treated as fixed.