View file PDFXpress/ads.php

<!-- ads.php -->
<div class="adsense">
    <!-- Your AdSense code goes here -->
    <!-- Replace ca-pub-XXXXXX and data-ad-slot="XXXXXX" with your own AdSense details. -->
    <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
    <ins class="adsbygoogle"
         style="display:block"
         data-ad-client="ca-pub-XXXXXX"
         data-ad-slot="XXXXXX"
         data-ad-format="auto"></ins>
    <script>
         (adsbygoogle = window.adsbygoogle || []).push({});
    </script>
</div>