title: OneSignal ID for the same user on different platforms
body: <p>First, thanks for baring with my question as well haha. Secondly.. I'm having a dilemma.</p>
  
  <p>I have an app, based on Firebase, which runs on iOS / Android and Web. It basically is a chat like Facebook's messenger.</p>
  
  <p>I am successfully using OneSignal for the iOS version... ( this was the first platform developed ). The issue arose when I started developing the web platform.. as per user, there is a OneSignalId generated upon registration. Issue with that is, how do I link the same account on different platforms, meaning, on iOS, say I have OneSignalId -- 1. </p>
  
  <p>When I connect to the web version with an account that already exists, from a browser which is not known by OneSignal yet, I'm getting a new OneSignalId .. and that's not desired.</p>
  
  <p>Is it possible to connect the OneSignalId that I already have, to the browser ?
  Thanks for baring with me. I've also asked them on Intercom ( their live support ) but nobody replied as of yet. </p>
  
  <p>I also don't seem to find anything inside SO or in their Docs.
  Have a great evening!</p>