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Check this step by step tutorial to add order attribute programmatically in your Magento 2 store.

Magento 2 Add Order Attribute Programmatically - FMEextensions

Learn how to add a custom order attribute in Magento 2 programmatically by creating a custom module, defining the attribute in the database, and displaying it in the admin panel and frontend.

How to Add Alt Text to Product Images in Magento 2?

How to Create Attribute Set Programmatically in Magento 2?

How to Add Order Attribute Programmatically in Magento 2?

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