How to integrate Live Helper Chat into third party application, E.g mobile?

The simplest way to integrate into a third-party application is just to have WebKit embed in your mobile app with the following embed code

Sample just without UUID attribute https://livehelperchat.com/lhcsamples/sample-5.html
Here we just set fscreen and UUID attributes additionally
How to pass logged user id or any other account related information
Show custom columns in chat list/window
If you want to strictly reopen the same chat for a visitor each time they return, you can use chat_id and chat_hash attributes Javasript arguments reference. In this scenario, you should first create the chat yourself using the Rest API and then store these values for future sessions.
Using widget theme options, you can enable display of previous chat messages.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Sample of full screen width</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        body,html{
            margin:0;
            padding: 0;
        }
    </style>
</head>

<body>

<!-- Place this tag where you want the Live Helper Status to render. -->
<div id="lhc_status_container_page" ></div>

<!-- Place this tag after the Live Helper status tag. -->
<script>var LHC_API = LHC_API||{};
LHC_API.args = {
    mode:'embed',
    lhc_base_url:'//demo.livehelperchat.com/', 
    fscreen: true,  // Make full screen
    theme:[2],      // Change to your theme
    department:[1], // Set your own department
    UUID : '<?php md5(user_id + "some random string"); ?>', // This will ensure that previous chats will be always assigned to the same online visitor profile even from different devices.
    wheight:450,
    wwidth:350,
    pheight:520,
    pwidth:500,
    leaveamessage:true,
    check_messages:false
};
(function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.setAttribute('crossorigin','anonymous'); po.async = true;
    var date = new Date();po.src = '//demo.livehelperchat.com/design/defaulttheme/js/widgetv2/index.js?'+(""+date.getFullYear() + date.getMonth() + date.getDate());
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
</script>

</body>

</html>