...
})(window,document,'FS','script','user');

<?php if (is_user_logged_in()) { ?>
var wpEmail = "<?php $current_user = wp_get_current_user(); echo $current_user->user_email; ?>";
var count = <?php echo wc_get_customer_order_count(get_current_user_id()); ?>;

FS.identify(wpEmail, { "displayName": wpEmail,
    "email": wpEmail,
    "orders_int": count });

<?php } ?>

</script>