Adding a custom field to Magento 2 checkout (delivery date, VAT number, gift message) is well-documented for Luma — and a moving target on Hyvä. Here is the complete path for both stacks, with quote extension attribute wiring and admin order display.
Most Magento 2 extensions ship for Luma only — Knockout bindings, RequireJS components, jQuery widgets. Hyvä replaces all three. The good news: a 4-step pattern handles 90% of ports. Here is the exact workflow with code for Klarna, Stripe, and Yotpo.
Kishan Savaliya12 min read
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