UPI: Anatomy of a Payment Transaction

6 hours ago

UPI transactions involve seven parties, but users only interact with the app, which initiates payment requests without handling money directly.
The app relies on a sponsor bank (Payment Service Provider) to connect to the network, verify the UPI ID, and encrypt the PIN, with multiple sponsors used for resilience.
Every payment routes through NPCI's central switch, which translates addresses, debits the payer's bank first, then credits the payee's bank, ensuring money leaves before arriving.
Declines are categorized as business (e.g., wrong PIN, insufficient funds) or technical (system failures), with technical issues becoming rarer as infrastructure improves.
For unresolved transactions, NPCI reconciles within 90 seconds, reversing debits if needed, with penalties for delays, ensuring user protection even during failures.

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