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Firebase allows inter-service communication through a feature called Firebase Cloud Messaging (FCM). FCM is a messaging service that enables reliable and efficient sending and receiving of messages between Firebase services, mobile apps, and web applications.

To use FCM, you need to integrate it into your Firebase project and configure sending and receiving messages through the appropriate SDKs or REST APIs. Once set up, you can use FCM to send messages between your Firebase services (such as Cloud Firestore, Cloud Functions, and Cloud Storage) and your client-side apps (such as Android, iOS, and web apps).

You can also use FCM to send notification messages to your app users, either directly or through Firebase Cloud Functions. With FCM, you can easily create scalable and reliable inter-service communication in your Firebase project.