Add custom data to order page with WooCommerce session.
Updated: compatibility with Woocommerce version 3+. You have missing the function to display this custom field value on the order edit page:
Add custom fields for Product orders for WooCommerce v3.0 and above. Product fields can be customized as required. Data is displayed on ...
You can add any custom field to your order emails by hooking in and specifying the name of the custom field. This can be useful if, for example, you want to ...
As part of this, we'll look at adding custom fields to WooCommerce
The Admin Custom Order Fields extension allows you to add fields to an order for ... Exported order data from this plugin will now include a new column for each ...
How the store owner receives the custom field data in new orders. How to add ...
WooCommerce Codex - Checkout Field Hook. Next we ...
Adding Custom Fields to Your WooCommerce Orders
Go to Plugins > Add New > Upload and select the ZIP file you just downloaded.