A native app has the right to run a browser-like component that can display any HTML.
To do so:
1) Add a WebView component
2) Set the URL of this WebView to an HTML script hosted at https://yourdomain (for example).
3) Set web cookies to persistent.
Heyday needs the HTML to be hosted by a domain, the HTML is whitelisted to display chat.
The HTML contains our snippet and will launch a full-screen chat, which assures that your chat will be full-screen on the mobile app.
For Android: use WebView
For iOS 7 and below: use UIWebView
For iOS 8 and above: use WKWebview
To assure that your customers and teammates can continue chat conversations even if the chat window is closed, set your web cookies to persistent.