I am using Android Webview with OneSignal integration. I need to get the OneSignal player ID. This is the tutorial picture

I have added all the details mentioned in the tutorial. Now when I want to see the id in console but I use this code

<script type="text/javascript">
    function init(oneSignalUserID){
        console.log(oneSignalUserID);
    }
</script> 

It return nothing. Please help me how to output the id so I can make wordpress ajax call php function for save into database.

Thanks