Payment Integrations

Every online shop hits the same wall: the demo integration works, then real money starts moving and the edge cases arrive uninvited. Failed webhooks, double charges, refunds that don't refund, subscriptions stuck in invalid states, taxes that "almost" work in the right country.

I plug payment providers into shops so the edge cases get caught before your customers find them.

Sounds familiar?

• Your checkout works, but you're scared to look at the failed-payment queue
• You picked a provider months ago and now you're not sure if you should switch
• "It's just a Stripe integration" turned into a 3-week debugging session about webhook signatures and idempotency
• You need recurring billing, multi-currency, or tax handling — and the docs don't quite match your reality

What you get

• A checkout flow that handles the boring 95% AND the painful 5% — failed payments, retries, partial refunds, currency mismatches
• Webhooks that are actually idempotent, signed, replay-safe, and don't double-charge customers when something hiccups
• Subscriptions and recurring billing that survive plan changes, payment-method updates, and dunning
• A clear answer on which provider fits your shop — and an honest take on switching costs if you've outgrown the current one

How I work

I start with your money flow, not the provider docs. Where does the cash actually move? Who needs to see what state, and when? What happens when a webhook arrives twice — or never? Most "payment integration" projects fail because they only modelled the happy path.

I'm comfortable across the major providers and pick based on your actual needs, not whichever one I've used most.

---

Tools I tend to reach for: Stripe (subscriptions, marketplaces, complex billing), LemonSqueezy (digital goods, EU VAT made simple), PayPal (DACH and consumer trust), Shopify (custom apps, headless storefronts, app extensions).