Add script before the closing body tag

Hi,

I need to add a script like below to my page. Could you please tell me the best way to do this? Thanks.

<script>
/* Replace ‘APP_ID’ with your app ID */
window.intercomSettings = {
app_id: ‘APP_ID’
};
/* Replace ‘APP_ID’ with your app ID */
(function(){var w=window;var ic=w.Intercom;if(typeof ic===”function”) {ic(‘reattach_activator’);ic(‘update’,intercomSettings);}else{var d=document;var i=function(){i.c(arguments)};i.q=[];i.c=function(args) {i.q.push(args)};w.Intercom=i;function l(){var s=d.createElement(‘script’);s.type=’text/javascript’;s.async=true;s.src=’https://widget.intercom.io/widget/APP_ID&#8217;;var x=d.getElementsByTagName(‘script’) [0];x.parentNode.insertBefore(s,x);}if(w.attachEvent) {w.attachEvent(‘onload’,l);}else{w.addEventListener(‘load’,l,false);}}})()
</script>