WooCommerce - A filter to add a tracking (or any other field for that matter) to order emails to customers.

gistfile1.txt

/* To use: 
1. Add this snippet to your theme's functions.php file
2. Change the meta key names in the snippet
3. Create a custom field in the order post - e.g. key = "Tracking Code" value = abcdefg
4. When next updating the status, or during any other event which emails the user, they will see this field in their email
*/
add_filter('woocommerce_email_order_meta_keys', 'my_custom_order_meta_keys');

function my_custom_order_meta_keys( $keys ) {
     $keys[] = 'Tracking Code'; // This will look for a custom field called 'Tracking Code' and add it to emails
     return $keys;
}

include in core?

hi every body
i can't use this code
after i user this code in function.php i receive an FATAL ERROR
how can i fix this problem ?
thank

So simpel.. So effective, this is what i've been looking for. Thank you so much!
Is there any way to add css/html to the 'Tracking Code'?

How do you add a custom order field to the text within the customer_completed_order email?

How would I change the label? Currently in the email it shows the custom field as the label. Can I customize that without changing the custom field?

I see now. Just write something in $keys['Label']