"message": "Hi, there!")
Once you configure push, you will have a Push API key which you set above and then just the push message. This code will send a message to all the users who installed the app. There is also an option to send a targeted push message, only to some users.
Any script is automatically exposed via a REST API so you can quickly invoke it from an app. If you need to customize your app and build custom APIs – Server Code script is what you need.