[ISSUE] Pass Tax Amout To Authorize.net via x_tax

My clients use authorize.net and are using the tax reports to see how much tax they have collected both online and offline. Currently only the offline transactions are showing tax and everything from the opencart website is not showing the tax amount. I did some research and I need to add.

<INPUT TYPE="HIDDEN" name="x_tax" VALUE="<?php echo $x_tax; ?>">
This is pretty simple to implement in template -> payment -> authorizenet_sim.tpl

I need to set the tax amount charged to $data['x_tax'] in
controller -> payment -> authorizenet_sim.php

would this work?
$order_info['tax']

if not any suggestions how to get the tax amount on the order would be appreciated.