Payment integration where the ledger and the gateway agree every morning
Taking a card payment is the easy part; every gateway has a working checkout in an afternoon. The hard part is the twenty per cent of transactions that do not go straight through — abandoned redirects, webhooks that arrive twice or never, partial refunds, failed renewals, chargebacks, currency rounding. We build the payment path so your own database is the record, the gateway is reconciled against it daily, and no payment exists in one place only.
- Stripe
- Razorpay
- PayU
- Node.js
- TypeScript
- Webhooks
What usually brings people here
- 01
The webhook returned 200 and dropped the payload
Your endpoint acknowledged the event, then threw inside the handler. Money moved and your system never heard about it. The gateway considers it delivered and will not resend.
- 02
The order was created twice
The user double-tapped, or the gateway retried the webhook, and there was no idempotency key. Two orders, one payment, and support finds out from an angry customer.
- 03
Nobody reconciles the settlement file
Gateway payouts are accepted on trust. Fees, refunds and reversals drift against the internal ledger for months until finance asks a question nobody can answer.
- 04
Failed renewals just stop
A card expires, the subscription silently lapses, and there is no dunning sequence, no email and no grace period. Revenue leaves without anyone noticing.
- Hosted or embedded checkout integration
- Signature-verified, idempotent webhook handlers
- Payment state machine in your own database
- Refunds, partial refunds and reversal handling
- Subscription plans, proration and dunning
- Daily settlement reconciliation report
- PCI-conscious flow with no card data on your servers
- Sandbox test suite covering failure paths
From first call to steady state
- 01
Model the payment states first
Initiated, authorised, captured, failed, refunded, disputed — written down with the legal transitions before any gateway code exists. Most payment bugs are missing states, not missing API calls.
- 02
Treat the webhook as unreliable
Signature verified, event stored raw before processing, handler idempotent on the event ID, plus a scheduled poll of the gateway API to catch anything that never arrived.
- 03
Test the unhappy paths in sandbox
Declined cards, 3D Secure challenges, timeouts mid-redirect, duplicate webhooks, out-of-order events. These are the cases production will send you in week one.
- 04
Ship with reconciliation on day one
A daily job compares gateway settlements against your ledger and flags every mismatch. If that report is empty each morning, the integration is working.
Benefits & business outcomes
What changes when this work is done properly — not activity metrics, business results.
- 01
Your database is the record of truth
Gateway webhooks reconcile daily against your ledger — abandoned redirects and missed events cannot leave money in one place only.
- 02
Refunds, retries and renewals handled
The twenty per cent of payments that are not clean paths are designed in — partial refunds, failed renewals, chargebacks and double webhooks.
- 03
Marketplace splits without hand-waving
Seller payouts and platform fees modelled explicitly when the business needs them — not bolted on after launch.
- 04
Migration without lost transactions
Provider switches staged with parallel reconciliation so historical and in-flight payments stay accountable.
The stack for this work
- Stripe
- Razorpay
- PayU
- Node.js
- TypeScript
- Webhooks
- PostgreSQL
- Queues
- Products launching subscriptions or one-off checkout
- Marketplaces splitting payments across sellers
- Teams whose payment data disagrees with the gateway
- Businesses migrating between payment providers
Working remotely with teams in United States, United Kingdom, Canada, Europe, United Arab Emirates, Saudi Arabia, Singapore, Australia, New Zealand and India.
Industries we serve
The same engineering patterns apply across sectors — the domain language and constraints change.
- SaaS & subscriptions
- E-commerce & D2C
- Marketplaces
- Edtech & memberships
- Healthcare payments
- Travel & hospitality
- Donation & nonprofit platforms
Why choose BuildsInfinity
Practical reasons teams choose BuildsInfinity for payment gateway integration — grounded in how we actually work, not a slogan list.
- 01
Checkout is not the hard part
Anyone can take a card in an afternoon. We quote and build the reconciliation and edge cases that decide whether finance trusts the numbers.
- 02
PCI scope kept honest
Hosted fields and redirects preferred so you do not accidentally become a card-data handler. Scope reduction is part of the design.
- 03
Provider-agnostic payment model
Internal payment states stay yours. Gateways are adapters — so switching providers later is painful but possible, not existential.
Related services
API Integration Services
Connect payments, CRM, messaging and internal systems — with the retry and reconciliation logic most integrations skip.
CRM Integration Services
Lead capture, two-way sync and deduplication between your product and the CRM — with field mapping that does not rot.
ERP Integration Services
Orders, inventory, invoices and master data moving between your ERP and everything else — reconciled and audited.
Need payment gateway integration?
Send a paragraph about the problem and you will get a considered reply from an engineer — a shape, a rough timeline and an honest view on whether we are the right fit. Request a consultation or project estimate anytime.