With our SaaS server and by helping with the OneSignal, we make a simple app to receive Push notifications.
GitHub App: https://github.com/AlvaradoAdam15/NotificationsExample
HitHub MySaaS: https://github.com/AlvaradoAdam15/MySaaS
GitHub PushWooshDemo: https://github.com/AlvaradoAdam15/PushWhooshDemo
GitHub page to test: https://AlvaradoAdam15.github.io/PushWhooshDemo