OneSignal: Add Push Notifications by Desktop, App, or Email

Each month, I’d get a couple of thousand returning visitors through browser push notifications that we integrated. Unfortunately, the platform we chose is now shutting down so I had to find a new one. Worse, there’s no way of importing those old subscribers back to our site so we’re going to take a hit. For that reason, I needed to choose a platform that’s well-known and scalable. And I found it in OneSignal. Not only