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Payment Gateway Integration for Web Applications

Integrate Razorpay, PayU and PayPal securely, from checkout to webhooks and reconciliation.

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Course overview

A hands-on course on taking online payments. You will model orders and payments, integrate popular gateways in sandbox mode, verify webhooks and handle failures and refunds.

What you will learn

  • Model orders, payments and refunds correctly
  • Integrate Razorpay, PayU and PayPal in sandbox mode
  • Verify payment signatures and process webhooks safely
  • Handle failures, retries and duplicate events
  • Reconcile payments against orders

Syllabus

  1. Module 1: Payment fundamentals

    • Orders and payments
    • Payment lifecycle
    • Compliance basics

  2. Module 2: Razorpay integration

    • Order creation
    • Checkout
    • Signature verification

  3. Module 3: PayU and PayPal

    • Hosted checkout
    • Return and failure flows
    • Gateway differences

  4. Module 4: Webhooks and reliability

    • Idempotency
    • Retries
    • Reconciliation

  5. Module 5: Security and testing

    • Secrets handling
    • Sandbox testing
    • Go-live checklist

Projects and assignments

  • A checkout flow with a sandbox payment gateway
  • A webhook handler with signature verification

Instructor

Amol Kharate

Founder and technical lead at FenvoraTech. Senior full-stack developer with 10+ years of experience, including integrating Razorpay, PayU and PayPal into production e-commerce and fintech products.

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