How To Send Push Notifications From Your Website With OneSignal (WordPress / Elementor)

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I have adult prn site with around 100k monthly visits.
I saw that one guy uses Onesignal, probably for "push subscriptions" or how that is called?
So I was thinking, maybe I should integrate it too. I can maybe later sell these subscribers something...
Actually its better to subscribe them to paid subscription immediately but Im not sure if its ok. They might get scared and leave. I dont want that.
Im not even sure if Onesignal supports anything like that?