Payment Gateway IntegrationServices
Accept payments in your website or app through the gateways your customers use, with confirmations, refunds and reconciliation handled properly.
Payment Gateway Integration Services: what the work involves
Taking a payment looks simple until the details arrive. A customer closes the browser after paying, a confirmation never comes back, a refund must be matched to the original order, or the same callback arrives twice. Each gateway behaves differently, and mistakes cost real money. Integration done carelessly produces orders marked unpaid for customers who paid, or goods shipped on payments that failed.
DevKey integrates gateways with the order state as the centre. We create the payment server-side, treat the gateway's webhook as the source of truth, verify signatures, and make handlers idempotent so duplicates are harmless. Card details never touch your servers. We support Stripe, JazzCash, Easypaisa and bank-hosted pages where your merchant account allows, and provide a reconciliation report matching settlements to orders.
Core features
Provider selection and onboarding help
We help you compare available gateways for your business type and walk through the merchant documentation each requires.
Server-side payment creation
Amounts and order references are fixed on the server, so a customer cannot alter the price from the browser.
Signed webhook handling
Gateway notifications are verified, processed once and written to the order, with out-of-order and duplicate events handled safely.
Refunds and partial refunds
Staff can refund full or partial amounts from the admin screen, with the gateway call, reason and order update recorded together.
Recurring billing and retries
Subscriptions, saved payment methods where permitted, and a sensible retry and notification flow for failed renewals.
Settlement reconciliation
Match gateway payout reports against your orders and invoices, listing differences such as fees, chargebacks and unmatched transactions.
What we get right before launch
Card data scope
Handling raw card numbers brings heavy compliance obligations. We use hosted fields or redirects so card data stays with the gateway, and we do not claim certification on your behalf.
Merchant account eligibility
Whether Stripe or a local gateway accepts your business depends on registration and the provider's own review. We design behind a gateway interface so you can change provider without rewriting checkout.
Failed and abandoned payments
Orders must not be fulfilled before confirmation. We model payment states clearly, expire unpaid orders and release held stock, instead of leaving them pending forever.
Tools and technology
- Node.js
- TypeScript
- Stripe
- JazzCash
- Easypaisa
- PostgreSQL
- Redis
- REST
- Message queues
Common questions, answered
Which gateways do you integrate?
We commonly integrate Stripe, JazzCash and Easypaisa, and can work with bank-hosted checkout pages and other processors that publish an API. Which are available to you depends on your registration and the provider's approval.
Do card details pass through our server?
No. We use the gateway's hosted fields or redirect pages, so card numbers go straight to the provider. This keeps your compliance burden lighter, though you remain responsible for your own obligations.
What if a customer pays but never returns to the site?
The gateway's webhook confirms the payment to your server independently of the browser, so the order is still marked paid. A reconciliation job also catches any notification that failed to arrive.
Can we test before going live?
Yes. Gateways provide sandbox environments, and we run scenarios for success, failure, duplicates and refunds there. Go-live is a configuration switch with a checklist, followed by one small real payment you verify.
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Ready to start your Payment Gateway Integration Services project?
Tell us what you need and we will come back with a clear scope, timeline and the questions worth answering before any build starts.