Payment Anatomy
A UPI payment in India
India's Unified Payments Interface processes a mobile payment through NPCI's switch in under 3 seconds.
Payment request to payer PSP
UPI message to NPCI
Debit request to remitter bank
Debit confirmation + credit instruction
Notification to beneficiary
Fun Fact
UPI processes over 14 billion transactions per month. The customer sees funds instantly, but interbank settlement happens in batches every 2 hours via RBI's RTGS.