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  • RRohit·Jul 28, 2026·8 min read

    How UPI Guarantees You're Never Charged Twice: The Architecture Behind India's Payment Backbone

    Idempotency ensures that no matter how many times a request is made — the result stays the same... If the same ID comes again → it replies with the same result (not a new payment) India’s UPI processes billions of...

    • System Design — High Level Design (HLD)
    • Low Level Design (LLD)
    • +2 more
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