Creation of Triggers/Actions/Searches for your app users with both of the following techniques.
REST Hooks
This technique is not only fast, but also very optimal with no load on the server.
2: Polling
This technique is not only slow, but also put burden on your server.
your app users will be able to connect their data from your app to other apps(Google Sheets, DOCs, Calendar, Facebook, slack, and many others who support Zapier.).