Hello!
1) You can send pushes from server code and from app using Push REST API. You don't have to use both. How do you want to send push?
2) How are you going to define device where you need to send push? Filter depends on that.
3) Are you going to send push at once or scheduled?
In fact we have detailed description on how to do that. Please take a look here http://docs.appery.io/documentation/b...