Add data to order details page

/**
 * Display field value on the order edit page
 */
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );

function my_custom_checkout_field_display_admin_order_meta($order){

echo 'This line will appear at the end of order details box';
            }
	

Author: Wojciech Borowicz

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