intercom.js

<script>
        (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/<YOUR APP ID>';
                    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>