How to get One Signal unique user id in Mobile?
<p>I am developing a restaurant app. I am using One Signal in my app to send notifications. Here while I place the order I need to send the unique Id of the one signal for a specific user for getting notification of "Your Order is placed successfully... It is in Progress.Please wait". For that I need the user's One Signal user id. How can I get it? I am newbie to One Signal. Please help me.</p>