Add a Custom Field to Magento 2 Checkout and Save It to the Order
Add a custom field to the Magento 2 checkout shipping step, send it with extension attributes, store it on the quote and copy it to the order the right way.
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Articles about UI Components
3 articles
How to Add a Custom Checkout Step in Magento 2
Add a new step to the Magento 2 Luma checkout with step-navigator, layout XML and a Knockout template, plus where to validate and store the data it collects.
Magento 2 UI Components and Knockout.js: The Basics
A practical intro to Magento 2 UI components and Knockout.js: uiComponent, templates, observables, imports and exports, jsLayout and the uiRegistry.