Part B Put this code to catalog/view/theme/default/template/common/success.tpl

jomniaga-opencart-success.tpl.php

<?php
/**
* Jomniaga Conversion code
*
* Put this file to catalog/view/theme/default/template/common/success.tpl
* before
*      <?php echo $content_bottom; ?>
* 
*/
if(isset($this->session->data['jomniaga'])){
  $conversion = $this->session->data['jomniaga'];
?>
  <script type="text/javascript" src="http://www.jomniaga.com/api/conversion?transtype=SALE&amount=<?php echo round($conversion['cva'],2);?>&tracking=<?php echo $conversion['cvn'];?>"></script>
  <noscript><img src="http://www.jomniaga.com/api/conversion?transtype=SALE&amount=<?php echo round($conversion['cva'],2);?>&tracking=<?php echo $conversion['cvn'];?>" width="1" height="1" border="0" /></noscript>
<?php
  unset($this->session->data['jomniaga']);
  
/**
* EO: Jomniaga Conversion code
*/
}
?>