From Blaine Johnson:
Paste this code as high in the of the page as possible:
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-52MKVXM');</script>
Additionally, paste this code immediately after the opening tag:
<iframe src="https://www.googletagmanager.com/ns.html?id=GTM-52MKVXM"
height="0" width="0" style="display:none;visibility:hidden"></iframe>
(1) Google Web Data Stream Analytics tag and (2) Intercom tag