Add Chat Widget JS API code and append to head

app/views/workarea/storefront/livechat/_livechat_javascript.html.haml

@@ -0,0 +1,9 @@
+- if Workarea::Livechat.enabled?
+  :javascript
+    window.__lc = window.__lc || {};
+    window.__lc.license = "#{Workarea::Livechat.license_number}";
+    ;(function(n,t,c){function i(n){return e._h?e._h.apply(null,n):e._q.push(n)}var e={_q:[],_h:null,_v:"2.0",on:function(){i(["on",c.call(arguments)])},once:function(){i(["once",c.call(arguments)])},off:function(){i(["off",c.call(arguments)])},get:function(){if(!e._h)throw new Error("[LiveChatWidget] You can't use getters before load.");return i(["get",c.call(arguments)])},call:function(){i(["call",c.call(arguments)])},init:function(){var n=t.createElement("script");n.async=!0,n.type="text/javascript",n.src="https://cdn.livechatinc.com/tracking.js",t.head.appendChild(n)}};!n.__lc.asyncInit&&e.init(),n.LiveChatWidget=n.LiveChatWidget||e}(window,document,[].slice))
+  %noscript
+    %a{:href => "https://www.livechatinc.com/chat-with/#{Workarea::Livechat.license_number}/", :rel => "nofollow"}> Chat with us
+    , powered by
+    %a{:href => "https://www.livechatinc.com/?welcome", :rel => "noopener nofollow", :target => "_blank"} LiveChat

config/initializers/appends.rb

@@ -0,0 +1,5 @@
+Workarea.append_partials(
+  'storefront.document_head',
+  'workarea/storefront/livechat/livechat_javascript'
+)
+