Market-leading payment integrations for Hungary’s largest bank.
Built and shipped the OTP SimplePay payment gateway plugins for WordPress + WooCommerce. Used by thousands of Hungarian merchants for years. The actual cash-register layer of a lot of small businesses.
In one paragraph.
OTP Bank is Hungary’s largest bank; SimplePay is their payment gateway. I built and maintained the official WordPress + WooCommerce plugins that connected merchants to that gateway — from authorisation flow to recurring billing to refunds.
Used by thousands of Hungarian e-commerce sites for years. Boring, critical infrastructure. The kind of work that has to be exactly right because it’s touching real money on real businesses.
The motivation.
Bank-grade infra needs people who care about reliability more than novelty. I cared. The work taught me how to ship systems where "mostly works" isn’t good enough — and that lesson has been useful across everything I’ve built since.
The features that matter.
Authorisation + capture
Full SimplePay flow with proper retry and idempotency handling.
Recurring billing
Subscription support with renewal hooks and dunning.
Refunds + chargebacks
Operational primitives for merchants. The boring 80% of payments.
Compliance + audit
PCI-aware code; full audit trail; regular bank-side reviews.