Magento / Mage-OS × Hyvä Development & Maintenance

What we do

Payment modules

Open-source GMO-PG integration for Hyvä Checkout (cards, 3-D Secure 2.0). Konbini, PayPay and others to follow. Install, customise, maintain.
B2B requirements & Fit-Gap

Customer-specific pricing, credit limits, approval flows, ERP sync. We sort standard / extension / custom before anyone writes code.
Hyvä migration & upgrades

Luma → Hyvä, Magento 2.4.x / Mage-OS upgrades. Extension compatibility audit through production cut-over.
Maintenance & advisory

Monthly report, patch decisions, incident response. You get a report even in a quiet month.

Scope: Credit card (MpToken.js tokenisation, 3DS2), authorise / capture / void / refund
Runs on: Mage-OS 2.3, Magento Open Source 2.4, Adobe Commerce; Hyvä Theme 1.4+, Hyvä Checkout 1.3.14+
Licence: OSL-3.0 (free)
Links: GitHub Demo Write-up
Coming: Konbini, PayPay, Rakuten Pay (commercial)

Monthly report: uptime, payment metrics, patch decisions, next month's recommendations → sample
Weekdays 10:00–19:00 JST on Slack / Chatwork / email; phone for emergencies.
Tokyo entity. In Tokyo several times a month; in-person meetings welcome.

Degi Kwag — Founder, Sengeki LLC

15+ years on Magento / Adobe Commerce, B2B, multi-store and ERP integration since Magento 1
~4 years at enish, Inc. (TSE: 3667)
Formerly a core team member at Vue Storefront (now Alokai)
Translator of the Korean edition of Magento 2 Developer's Guide (Branko Ajzele, 2017)
Hyvä licensee since 2022; early Mage-OS community