Add page numbers to invoice

-- url of the page with the problem -- : www.softdune.com/
-- HikaShop version -- : 4.2.1
-- Joomla version -- : 3.9.5
-- PHP version -- : 7.3.4
-- Browser(s) name and version -- : Chrome 73.0.3683.103 

Is there an way to add the page number and total number of pages on the Invoice.
Example: "pages: 2/4"

Is there a way to do this without the need to buy the HTML2PDF plugin?


I'm currently creating the PDF by pressing the 'PRINT' button during the display of the INVOICE.

You can find it in the invoice.php

<div id="print" style="float:right">
<a class="btn btn-primary" href="#" onclick="document.getElementById('print').style.visibility='hidden';window.focus();window.print();return false;">
<i class="fa fa-print"></i> <?php echo JText::_('HIKA_PRINT'); ?>
</a>
</div>

This opens a screen (which looks like PDF).
In the options it allows to select the Headers/Footers.
The footer includes the page numbering.
But there is information in the footer/header which I would not like to have on my invoice: example: URL of page...

The footer looks like:
www.mysite.com/administrator/index.php?o...=order&task=edit&cid []=91&cancel_redirect=L2FkbWluaXN0cmF0b… 1/2

Do you know how to change these inputs?