UPI — Unified Payments Interface
What is UPI?
UPI is India’s real-time payment system enabling instant fund transfers between bank accounts via mobile apps. Launched in 2016 by NPCI, it handles 10+ billion transactions monthly (2024), making it the world’s largest payment platform.
How UPI Works
Transaction Flow
- Sender Opens App: Selects UPI, enters recipient’s UPI/VPA
- Authenticates: Enters MPIN or uses biometrics
- Verification: Sender’s bank validates
- Processing: NPCI routes to receiver’s bank
- Confirmation: Instant SMS/notification to both
Key Entities
- Payer PSP: Sender’s app (PhonePe, Paytm, GPay)
- Payee PSP: Receiver’s app
- NPCI: Central switch routing transactions
- Bank: Settlement participant
UPI Features
Payment Types
- P2P Transfer: Person to person
- P2M Transfer: Person to merchant (QR, UPI ID)
- Collect Request: Request money from someone
- Bill Payments: Via BBPS integration
- UPI Lite: Offline low-value payments (<₹500)
Advanced Features
- UPI Autopay: Recurring payments (SIP, subscriptions)
- UPI International: Singapore, UAE, France, UK
- Credit on UPI: Credit line payments (new)
- Voice UPI: Voice commands for transfers
Transaction Limits (2024)
| Transaction Type | Limit |
|---|---|
| Per Transaction | ₹1,00,000 |
| Daily Limit | ₹2,00,000 (customizable) |
| UPI Lite | ₹500 per transaction |
| PPI Wallet | ₹10,000/month |
UPI Statistics (2024)
- Monthly Volume: 10+ billion transactions
- Monthly Value: ₹18+ lakh crore
- Registered Users: 400+ million
- Merchants: 50+ million
Security Features
Authentication
- MPIN: 4-6 digit secret PIN
- Biometrics: Fingerprint, face recognition
- Device Binding: Single device access
- Tokenization: Card data protection
Fraud Prevention
- Handle Verification: Never pay to fake IDs
- Screen Share: Never share during payment
- Transaction Alerts: SMS + push notifications
UPI Global Expansion
Countries Live
- Singapore: GPay, liquid, NTUC
- UAE: LuLu, Wallets
- France: Bhim, indian banks
- UK: Zips
How International UPI Works
- Link Indian bank account to international number
- Convert INR to local currency automatically
- Same UPI ID works abroad
Common Issues & Solutions
Failed Transactions
- Insufficient Balance: Add funds
- Bank Server Down: Try later
- Daily Limit Reached: Wait or increase limit
- Wrong UPI ID: Verify recipient
Dispute Resolution
- Bank Level: 24-48 hours
- NPCI Level: For PSP disputes
- RBI Ombudsman: For unresolved issues
Prime References
- NPCI UPI - Official documentation
- UPI Chalega - Government campaign
- RBI Payment Systems
This 101 guide is part of DPIWatch’s citizen education initiative. Last updated: March 2026.