Flutter and Firebase: Dynamic push notifications like Whatsapp - firebase

Most tutorials I've seen on the topic of notifications either broadcast notifications through the Firebase Console, or create in-app notifications that don't work if the app is in the background or is closed completely.
Is there a way to make notifications pop up dynamically using Flutter and Firebase even when the app is closed? Something like Whatsapp or Instagram notifications.
Reference image for what I mean by notifications like Whatsapp: https://www.techidence.com/wp-content/uploads/2020/10/WhatsApp-Nootifications.jpg

You won't be able to generate dynamic notifications directly from Flutter. Since to do this, the App has to be active. Usually you would send these kind of notifications from some kind of backend. Google Cloud Messaging exposes an API for this, which allows you to send POST requests to an Endpoint, and Google handles the sending of the actual notification.
Check this article under the point "1. Send Notification"
https://medium.com/#selvaganesh93/firebase-cloud-messaging-important-rest-apis-be79260022b5

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How to send an actionable push notification through Ionic?

I am currently using Airnotifier and Firebase Cloud Messaging. From some other questions and after trying by myself, it seems Firebase does not support actionable notifications. Is there a way to create one somehow, or can we somehow send a request to the user's device and the application on that device can create an actionable local notification?
UPDATE: Just checked with the FCM API and SDK, title and body fields are accepted but actions and click_action are not seen anywhere. Is there a way to verify if those data have been given or if those are the correct name for the fields?
UPDATE2: gcm.notification.actions has shown in the notification received in iOS, but not click_action which I included in the notification field.
UPDATE3: It seems the "actions" field magically disappears after the "schedule" function is called in ionic's local notification plug in.

React native app sending push notification while device is offline

I'm about to develop an app similar to a birthday reminder and I plan to use firebase for push notifications but what makes me second question my choice is whether users will be able to receive a birthday notification if they are offline(not connected to internet for the whole birthday day). I know firebase has some offline persistence support but I'm not sure if this includes push notifications support. Are there any options to achieve that with firebase or with any other tool compatible with react native?
If the device is not connected to the internet, it is going to be impossible to deliver messages to it through Firebase Cloud Messaging or other internet protocols.
The common way to deal with such a scenario is to deliver the message to the device when the user does have an internet connection, and then only display it once it's the right time. By sending a data-only message through FCM, your application code controls exactly what happens with the message data.
There are essentially two types of notifications: in app messaging and cloud messaging. Both are offered by Firebase: In App Messaging and FCM (Firebase Cloud Messaging).
The details you've given about your app is a little bit vague but if you're asking for push notifications, then FCM does the job. FCM will send notification when the app is on background or killed (exited out). When you say device is offline I'm assuming you mean when the user isn't using the phone. Yes, the notification will still come.
https://firebase.google.com/docs/cloud-messaging

Show notification based on a Firebase values

I want to show notification in my app even if the app is closed.. I don't need Firebase's Push Notification Service. The idea is similar to WhatsApp's message notification service.
When a value is added to firebase by a user another user should receive notification that there is a value change
Can someone tell me how this is done and What should I use to achieve this?
Push notifications for all major apps run through APNS for iOS, and Firebase Cloud Messaging for Android. While the apps may use a higher-level service from their application code, those services depend on APNS and FCM for the actual message delivery.
To see an example of how to build a notification system on top of this, based on values being written to a database, see Send Firebase Cloud Messaging notifications for new followers.

How to create a "real" iOS push notification from Firebase topic messages if the app is not running?

As far as I understand messages on subscribed topics are received through the socket connection.
So while the app is running in the background I could create local notifications and "fake" notification that pop up on the home screen and are visible in the notification center.
But is there a way to receive topic pushes if the app is closed/not running in the background?
I'm grateful for any kind of feedback as I couldn't find any documentation regarding that specific use case.
Just to clarify: I am talking about (subscribed) topic messages in firebase NOT the firebase messages. I am used to the generic iOS push notifications handling and the involved lifecycle methods. All I need to know is how firebase topic messages can be sent via apns notifications.
With Firebase Messaging you can send notifications so the app is closed (it must be installed), basically it is configured in the AppDelegate the methods and configuration according to your need, you can see more information here Firebase Messaging
No you can’t, setup your configration in apo delegate and firebase settings, when the app is offline firebase talked directly to the APN which called the nitification center in your iphone but you don’t have access on it during the application is closed.

Enabling the notification feature for my firebase app

I have made an app with the use of firebase. It is basically a chat application in which you van send and receive the text and images. I want to add a functionality in it that whenever a user sends a msg, then another user should get a notification . When I try to send a notification through the firebase console, then it is working, but when a user messages through the app, then it is not showing any notification to another user. So, can anyone tell me that how can this functionality be achieved ?Also, provide some sample code to see how things are working
You need to use cloud functions for that:
https://firebase.google.com/docs/functions
Cloud Functions for Firebase lets you automatically run backend code in response to events triggered by Firebase features and HTTPS requests
First, you can register the user to a topic:
FirebaseMessaging.getInstance().subscribeToTopic("news");
https://firebase.google.com/docs/cloud-messaging/android/topic-messaging
Then when the message is sent to the database, you can use onWrite() in cloud functions which is a database trigger to be able to send the notification.
https://firebase.google.com/docs/functions/database-events

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