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How to Integrate a Payment Gateway into a Web App Using Razorpay

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Integrating a payment gateway into a web application requires more than a payment button — it involves backend APIs, secure authentication, webhooks, and error handling. A typical flow moves from the customer through the web app and backend to the payment gateway and then the bank, with the backend verifying the transaction before fulfilling the order. Developers should evaluate gateways on factors such as supported payment methods, transaction fees, API documentation, and webhook capabilities before choosing one. For Indian applications, gateways like Razorpay support UPI, cards, net banking, and wallets, and offer a test environment for safe development. A key security principle throughout is to keep secret API credentials server-side and never expose them in frontend code or public repositories.

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