Unified Payments Interface

The Unified Payments Interface (UPI) is an instant payment system that transfers money directly between bank accounts through mobile applications. Developed and operated by the National Payments Corporation of India (NPCI), it provides a common layer through which customers of different participating banks and payment applications can transact in real time.

Institutional and technological architecture

UPI is built over the Immediate Payment Service infrastructure and operates continuously, including weekends and holidays. The Reserve Bank of India regulates payment systems, while NPCI provides the rules, routing switch and interbank clearing arrangements for UPI.

• A payment service provider bank connects its own application, or supports a third-party application, to the UPI network.
• The remitter bank holds the payer's account, while the beneficiary bank receives the funds; these may be different participating banks.
• A UPI ID, also called a virtual payment address, can identify a user without requiring bank-account details to be disclosed for every transaction.

How a payment moves

The payer initiates a transfer by selecting the recipient, entering the amount and authorising it with the UPI PIN. UPI supports both payer-initiated transfers and payment requests that become effective only after the payer approves them.

• The payment application sends the instruction through its PSP bank to the NPCI switch, which identifies and routes it to the concerned banks.
• The remitter bank authenticates the instruction, verifies available funds and debits the payer's account.
• The beneficiary bank credits the recipient's account and returns confirmation through the same network, giving both users a real-time payment status.
• NPCI determines participating banks' interbank obligations, which are settled through the authorised settlement framework.

Why interoperability matters

A common protocol allows a user of one participating bank or application to pay a user linked to another, creating interoperability rather than isolated payment networks.

• Direct bank-to-bank transfers reduce dependence on cash and remove the need for both parties to use the same application.
• Simple identifiers and round-the-clock availability lower transaction friction for individuals and small businesses.
• Inclusion still depends on access to a bank account, suitable digital channels, connectivity, literacy and effective protection against fraud.