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add_action( 'woocommerce_thankyou', 'adroll_pixeltracking' );
 
function adroll_pixeltracking( $order_id ) {
   $order_total = $order->get_total();
 ?>

<script>
adroll_conversion_value_in_dollars = <?php echo $order_total?>;
adroll_custom_data = {"ORDER_ID" : "<?php echo $order_id?>"}
</script>
 
<?php
}