A WebView wrapper can never show the subscribe prompt — so it can never send push. Your Web2App app runs on Chrome, so users opt in for real and get notifications even when the app is closed.
Tap below — the real subscription prompt opens, the same one your end-users see.
Tap allow → this device joins your audience → the server delivers through the OneSignal API, even when the app is closed.
For buyers: the same server adapter also supports WonderPush, FCM, PushAlert, PushEngage, Truepush or your own backend — switch providers without touching the app.
For buyers: connect your provider keys on the server, then reuse the same provider path for real campaigns.