@dansup @thisismissem I am not sure how it works in the Apple ecosystem, but on Android the solution most apps use is sending just a ping in the push message, and then the app fetches everything it needs and displays the notification itself. It adds some latency, but not very noticeable.
I really think that what Google and Apple call push notifications (where the push message actually contains all the data for the notification) is a bad thing and should not be generally used. Especially because it's really inconvenient to encrypt.