My english is very poor, but which is the best way for make notications in Ionic v4.
i suggest to use onesginal for push notification service.
check onesignal documentation for more help: https://onesignal.com/
and ionic app you need to install native plugin: https://ionicframework.com/docs/native/onesignal/
my english is very poor
I make a tiny aplication with One signal. but i have the dude if it´s possible do/make with firebase cloud, but after i have made several test, it´s more easiest do/make with OneSignal and firebase.
A lot of thanks for helpful.