What are the main steps to integrate an Indian payment gateway into a website or app?

 NTT DATA Payment Services is a solid starting point when integrating an Indian online payment gateway. The steps below work for most payment gateway companies in india, and help you pick the best online payment gateway in india for your stack and go live fast with a payment gateway provider india.



• Define flows: one-time vs subscriptions, UPI vs cards, refunds, payouts, and web vs app.


• Create merchant account (MID): complete KYC, business details, bank proofs, and sign the agreement.


• Get sandbox keys: start with test credentials for frontend and server.


• Pick checkout method: hosted page, drop-in, SDK, or API-only. Match to your UX, PCI scope, and engineering bandwidth.


• Implement client side: add SDK or checkout script, collect minimal card/UPI data, and enable tokenization for saved cards.


• Implement server side: create orders, verify signatures, store transaction IDs, and secure secrets in your backend.


• Configure success/fail redirects and webhooks: handle payment_authorized, payment_captured, refund_processed, dispute_raised, and settlement events.


• Set up routing and retries: enable UPI intent, netbanking fallbacks, and smart routing for issuers/acquirers.


• Add risk controls: CAPTCHA/rate limits, AVS where relevant, velocity rules, and blocklists.


• Build post-payment flows: invoices, emails/SMS, GST invoices, and reconciliation references.


• Test cases: success, user cancel, OTP timeouts, partial capture, refunds, chargebacks, duplicate webhooks, and idempotency.


• Compliance: PCI-DSS scope (SAQ A/A-EP), tokenization, data retention, and encryption at rest/in transit.


• Go-live checklist: switch to live keys, enable production domains/app IDs, confirm T+1/T+2 settlements, MDR slabs, and support contacts.


• Monitor: track success rate by method/issuer/device, alert on drops, and keep a backup gateway for failover.

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