Adding Transaction-Specific Conversion Tracking from Adwords

function cdata_markupfix($content) {
    $content = str_replace("]]>", "]]>", $content);

    return $content;
}

function cdata_template_redirect($content) {
    ob_start('cdata_markupfix');
}

add_action('template_redirect', 'cdata_template_redirect', -1);

function my_custom_tracking( $order_id ) {

$order = wc_get_order( $order_id );
$totalValue = $order->get_total();
$currency = $order->currency;
?>

<!-- Google Code for Purchase Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 1234567890;
var google_conversion_language = "en";
var google_conversion_format = "1";
var google_conversion_color = "666666";
var google_conversion_label = "xxxxXXx1xXXX123X1xX";
if (<?php echo $totalValue ?>) {
    var google_conversion_value = <?php echo $totalValue ?>;
    var google_conversion_currency = <?php echo $currency ?>;
}
    var google_remarketing_only = false;
/* ]]> */
</script>
<script type="text/javascript"
src="//www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
    <div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt=""
src="//www.googleadservices.com/pagead/
conversion/1234567890/?value=
<?php echo $totalValue ?>&amp;currency_code=<?php echo $currency ?>
&amp;label=xxxxXXx1xXXX123X1xX&amp;guid=ON&amp;script=0">
    </div>
</noscript>
<?php
}

add_action( 'woocommerce_thankyou', 'my_custom_tracking' );