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Foundations · easy

1. Unified Payments Interface (UPI) System Architecture

The 4-party interoperable architectural blueprint by NPCI.

1 min read2 questionsup to 50 XPtopic 1/4

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UPI, designed by the National Payments Corporation of India (NPCI), is an interoperable instant real-time payment protocol. It operates as a 4-party model: 1. Payer / Remitter Bank: Houses the debtor's account. 2. Payee / Beneficiary Bank: Houses the creditor's account. 3. Payer & Payee PSPs (Payment Service Providers): Third-Party Application Providers (TPAP like PhonePe, Google Pay, BHIM). 4. NPCI Central UPI Switch: The Layer-7 routing, authorization, security, and settlement engine.

Virtual Payment Addresses (VPAs / UPI IDs like `alice@okhdfcbank`) abstract away underlying 16-digit bank account numbers and IFSC routing codes.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What entity operates the core switching and settlement infrastructure for UPI in India?

  2. 2. What is a Virtual Payment Address (VPA) in UPI?

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