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 Extension Attributes
2 articles
Magento 2 Extension Attributes: Add Data to Orders and APIs
Add custom data to Magento 2 entities with extension attributes: extension_attributes.xml, repository plugins, storage, REST output and the usual pitfalls.