Woocommerce_Checkout_Update_Order_Meta

To add a new checkout field in WooCommerce, you can use the `woocommerce_after_order_notes` action hook to display the new field on the checkout page. Additionally, you’ll need to use the `woocommerce_checkout_process` and `woocommerce_checkout_update_order_meta` filter hooks to handle the validation and saving of the field data.