Masterclass: FinTech Engineering, Digital Payment Gateways & Banking API Architecture

Master digital payment gateways, UPI 2.0 & NPCI switch protocols, ISO 8583/20022 messaging, immutable double-entry ledgers, and PCI-DSS compliance.

12 Weeks
Online / Offline
English & Tamil
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Course Overview

The modern economy runs on digital transactions, and FinTech engineering is one of the highest-paying software disciplines globally. Building financial software demands an uncompromising focus on correctness, zero data loss, and mathematical precision where standard software engineering paradigms fall short. This masterclass provides deep, production-grade training in architecting fault-tolerant financial backend systems. You will learn how modern payment aggregators like Razorpay, Stripe, and PhonePe process millions of transactions per day, implement bulletproof idempotency keys, design append-only double-entry accounting ledgers, parse banking switch protocols (ISO 8583 & ISO 20022), build real-time UPI switches, automate end-of-day multi-way reconciliation, and maintain PCI-DSS v4.0 compliance.

Skills You Will Master

Digital Payment Gateways UPI 2.0 & NPCI Architecture Double-Entry Ledgers ISO 8583 & ISO 20022 Protocols Distributed Saga Transactions Idempotency & Webhook Systems Financial Reconciliation Engines PCI-DSS v4.0 & Tokenization HSM & Payment Cryptography Banking Open APIs & CBS

Course Curriculum

1. FinTech Infrastructure, Payment Lifecycles & Banking Ecosystems

  • Overview of global and Indian payment systems (UPI, IMPS, NEFT, RTGS, Cards, NACH)
  • Ecosystem roles: Cardholder, Merchant, Acquirer, Card Networks (Visa/Mastercard/RuPay), and Issuing Banks
  • Core Banking Systems (CBS) architecture and integration models
  • Payment Gateway vs Payment Aggregator vs Payment Switch mechanics
  • Regulatory frameworks: RBI Master Directions, NPCI guidelines, and ISO 20022 compliance

2. Digital Payment Gateway Engineering & Idempotency

  • End-to-end payment authorization, capture, void, and refund lifecycles
  • Designing bulletproof idempotency keys to prevent duplicate transactions under network retries
  • Secure webhook architecture: HMAC-SHA256 signature verification, exponential backoff, and dead-letter queues (DLQ)
  • State machine modeling for payment states (Initiated, Pending, Authorized, Captured, Failed, Refunded)
  • Low-latency transaction routing and intelligent dynamic gateway fallback

3. UPI 2.0, NPCI Switch & Instant Payment Architecture

  • UPI protocol deep dive: Virtual Payment Addresses (VPA), UPI Switch, and PSP architecture
  • Real-time collect requests, intent flow, dynamic QR codes, and UPI Autopay mandate recurring billing
  • Synchronous vs asynchronous payment status inquiries and timeout reconciliation
  • NPCI clearing and settlement file formats (NTS, CBR, and ICR files)
  • Building high-concurrency UPI webhook consumers processing thousands of TPS

4. Financial Ledgers, Double-Entry Accounting & Distributed Sagas

  • Fundamental principles of immutable double-entry bookkeeping: Assets, Liabilities, Equity, Debits, and Credits
  • Database schema design for zero-drift financial ledgers with append-only transaction logs
  • Balance derivation vs cache tables: Enforcing mathematical invariants (Σ Debits = Σ Credits)
  • Distributed transaction coordination without 2PC: Orchestrated and Choreographed Saga patterns with compensating actions
  • Pessimistic vs optimistic locking and atomic ledger writes under high concurrency

5. End-of-Day Financial Reconciliation & Settlement Engines

  • Mechanics of financial reconciliation: Three-way matching (Internal Ledger vs Payment Gateway vs Bank Settlement File)
  • Parsing and processing multi-gigabyte bank settlement files (MT940, CAMT.053, CSV) using streaming batch workers
  • Handling edge cases: Chargebacks, disputes, partial refunds, delayed bank credits, and fee deductions
  • Automated discrepancy detection, exception queues, and automated dispute resolution workflows
  • Merchant settlement payouts: Split payments, T+1/T+2 settlement batching, and payout APIs

6. Financial Security, PCI-DSS v4.0, Tokenization & Production Capstone

  • PCI-DSS v4.0 compliance architecture and minimizing Cardholder Data Environment (CDE) scope
  • Network tokenization and card vaulting architecture using HSM (Hardware Security Module) emulation
  • End-to-end financial encryption (AES-256-GCM, RSA asymmetric key pairs, and TLS 1.3 mutual auth)
  • Fraud detection fundamentals: Rule-based risk engines, velocity checks, and anomaly detection
  • Capstone Project: Production-grade Payment Gateway & Double-Entry Ledger System with Live Mock Banking Simulator

Local Training Campuses & Placement Drives

Classroom & hybrid batches in Coimbatore & Chennai

Coimbatore • Training

FinTech Engineering, Digital Payment Gateways & Banking API Architecture
Chennai • Training

FinTech Engineering, Digital Payment Gateways & Banking API Architecture

Take the Next Step in Your Career

Join our comprehensive Masterclass: FinTech Engineering, Digital Payment Gateways & Banking API Architecture program and gain real-world skills that employers demand.

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