Cloud Messaging - Firebase - Android

Question

Hello,
I need to create such a thing:
Firebase sends a notification to a specific phone when a specific document is updated in firestore.
Now, I have all the logic and code, but where can I run the code on firestore that will do everything? I need firebase to be like a service that listens to document changes and alert specific phones that need to be alerted.

Answer 1

Go to https://firebase.google.com and look at the initial setup