Payments & Checkout Engineering
Most payment work looks finished in sandbox. Then live traffic brings declines, duplicate webhooks, and partial refunds nobody planned for. We build gateway integrations and checkout flows that hold up after launch — and we test them in production with real cards.
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What Breaks After Launch
Payment integrations rarely fail in testing. They fail three weeks in, when a customer's card declines mid-renewal, the processor retries a webhook, or a partial refund hits an order state the code never considered. Those failures are quiet — no error page, no alert, just orders stuck in limbo and revenue that never arrives. We engineer for the failure modes first, because after fourteen years of WordPress work we know that is where payment projects are won or lost.
- Duplicate webhook deliveries handled exactly once
- Declines and timeouts leave orders in a truthful state
- Partial refunds and voids wired through to the gateway
- Gateway outages fail visibly, not silently
- Logs a human can read when something does go wrong
Gateways Stripe and PayPal Don't Cover
Stripe and PayPal cover the easy cases. But plenty of stores need a regional processor with better local rates, a B2B provider that supports invoicing and terms, or a specialist gateway their industry requires — and none of them have a maintained WooCommerce plugin. We build those integrations from the processor's API up: payment capture, saved payment methods, webhooks, refunds, and reporting, all behaving like a native WooCommerce gateway.
- Regional processors with no official WooCommerce support
- B2B gateways — invoicing, terms, purchase orders
- Saved cards and tokenised payment methods
- Multi-currency and local payment method support
- Built against the processor's API, not a wrapper
Checkout That Is Measured, Not Guessed
A checkout rebuild that is judged by how it looks is a coin flip. We track completion rate before and after every change we make, so you know what the work did to revenue — not what anyone thinks it did. When we take over a checkout, we instrument it first, change it second, and report the difference. That discipline is the reason our checkout work starts with an audit rather than a redesign.
- Completion rate measured before and after every change
- Drop-off tracked per checkout step
- Field-level friction identified and removed
- Express payment methods where they genuinely help
- No redesigns justified by opinion alone
What You Get With Payments & Checkout Engineering
Custom Gateway Integrations
Regional and B2B payment processors with no WooCommerce plugin — built as first-class gateways, not iframe workarounds.
Checkout Block Support
Gateways built for the WooCommerce checkout block, not just the legacy shortcode — so store updates never strand your payment method.
Idempotent Webhooks
Duplicate webhook deliveries are a fact of life. Ours process once, no matter how many times the processor retries.
Refunds & Voids Covered
Full refunds, partial refunds, and voids wired through to the gateway — including the edge cases most integrations skip.
Failure-Mode Design
Declines, timeouts, and gateway outages handled deliberately — the order state stays truthful and the customer gets a clear path.
Production Testing
We test with real cards on the live gateway before handover. Sandbox passing is not the finish line.
Our Process
A proven process that delivers results, on time and on budget.
Map the Money Flow
We document every path a payment can take — success, decline, retry, refund, void, chargeback — before writing code.
Build & Harden
The integration is built with idempotent webhooks, explicit state transitions, and logging you can actually read.
Test in Production
Real cards, real gateway, live edge cases — declines, duplicate deliveries, partial refunds — verified before launch.
Launch & Monitor
We watch the first live transactions with you and hand over runbooks for the failure modes we designed around.
Is This Service Right for You?
Stores that need a payment processor WooCommerce does not support out of the box — regional gateways, B2B processors, or providers whose official plugin is broken or abandoned. Also stores whose checkout was rebuilt for looks and now leaks orders.
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