APN (apple push notify service): Apple lets you route a push notification to a cell phone FCM (firebase cloud messenger): Google will let you push notification

APN (apple push notify service): Apple lets you route a push notification to a cell phone FCM (firebase cloud messenger): Google will let you push notifications to either android devices or iOS through APN, transparently abstracting device differences away from you Twilio Notify: Twilio will send either over SMS or FCM, abstracting the presence of the app install away from you I know this is a good thing as software gets easier, and I'm aware that all software works through abstraction, but for web services in particular this seems like crazy nested service glue.