Set a Tracking Number link on customer email notifications in Woocommerce 3
问题 I've managed to get this together and now I'm trying to make the number that is being entered into the custom field (saved to the order) to be linked in the order email. Here's the code: // create the metabox add_action( 'add_meta_boxes', 'bdev_add_postnord_meta_box' ); if ( ! function_exists( 'bdev_add_postnord_meta_box' ) ) { function bdev_add_postnord_meta_box() { add_meta_box( 'postnord_field', __('PostNord Parcel ID','woocommerce'), 'bdev_add_postnord_for_tracking', 'shop_order', 'side',