WooCommerce Checkout Email Validation

    //Add a clearout callback method for woocommerce_after_checkout_form action hook 
    add_action('woocommerce_after_checkout_form', 'clearout_add_jscript_checkout');
    // Clearout callback method to run when woocommerce_after_checkout_form hook fire
    //This method will return Clearout JS Widget snippet to the client and will automatically
    //enable real-time email address validation in checkout form  

    function clearout_add_jscript_checkout() {
    ?>
    <!-- Clearout JS Widget - start -->
    <script>
    var clearout = window.clearout = window.clearout || [],
        opts = {
            app_token: "2dbc074ff59235710274:ac8960425urb23b123343",
            mode: "ajax",
            api_url: "https://api.clearout.io",
            block_free_account: true, // Blocks free accounts eg gmail.com
            block_role_account: true // Blocks Rolebased accounts eg, [email protected]
        };
        clearout.push(["initialize", opts]),
        function () {
            var t = document, e = t.createElement("script"), 
            a = t.getElementsByTagName("script")[0];
            e.type = "text/javascript", e.async = !0, 
            e.src = "https://clearout.io/wp-content/co-js-widget/clearout_js_widget.js",
            a.parentNode.insertBefore(e, a)
        }();
    </script>
    <!-- Clearout JS Widget - end -->

    <?php
    }