Penetration Testing for NPCI UPI & Indian Banking APIs: BOLA, Tokenization & Tamper Defense
Comprehensive engineering guide to testing UPI integration APIs, payment gateways, and core banking switches in India. Covers NPCI security circulars, mobile SDK reverse engineering defense, Card-on-File Tokenization (CoFT), request payload replay mitigation, and race conditions in financial settlements.
Interactive Technical Checklist (4 Verification Checkpoints)
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[API Security] Validate that UPI callback webhooks verify HMAC signatures against merchant secret keys.Mandate: NPCI Webhook Safety
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[API Security] Prevent race condition double-transfers by enforcing distributed Redis locks on transaction IDs.Mandate: Zero Double-Spend
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[Mobile Security] Implement SSL certificate pinning and runtime integrity checks (Frida/root detection).Mandate: Mobile SDK Hardening
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[Tokenization] Ensure Card-on-File Tokenization (CoFT) masks card data; no raw CVV/PIN stored in logs.Mandate: RBI CoFT Standard
With UPI processing billions of monthly transactions in India, payment APIs are prime targets for automated credential stuffing, parameter tampering, and callback spoofing.
Vulnerability Deep Dive: UPI Callback Spoofing
A common flaw in Indian payment integrations occurs when merchants update order status based on HTTP callback parameters (e.g., status=SUCCESS&txnid=123) without verifying the cryptographic HMAC signature generated by the payment gateway switch.
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