Firebase A/B testing with multiple apps? - firebase

Is it possible to setup a firebase A/B testing with both android/ios or android-release/android-debug ?
I could only select one of the app I registered with firebase

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Firebase A/B testing from Backend

it is possible to configure firebase A/B testing from backend?
I want to be a proxy from our front-ends (app, web) customers.
But i cannot find any APIs or Documentation from backend.

Firebase React Native A/B Testing. How to get Firebase Instance ID tokens?

https://firebase.google.com/docs/ab-testing/abtest-with-console
This page shows only Native code. I can't find React Native / javascript code.
Looks like you could use React Native Firebase. Documentation states you can use A/B Testing with Remote Config, Cloud Messaging, or In-App Messaging. https://rnfirebase.io/remote-config/usage.
To get the Firebase Token, you can use the messaging package - https://rnfirebase.io/reference/messaging#getToken

Is it a must to use firebase when deploying a flutter app even though I am using firebase in my code?

I have a flutter app, I previously deployed, which I added firebase even though I didn't use their database. Now, I have another project that does not use firebase. My question is:
Is it a must to use firebase when deploying a flutter app even though I am using firebase in my code?
There is no (explicit or implicit) requirement to use Firebase for your Flutter app. And even when you use Firebase, you don't have to use all of its (18 or so) products.
You can use parts of Firebase that you like, and use alternative products that you prefer for other parts.
For example, it is quite common for (Flutter) web apps to use Firebase Authentication to sign users in, and then use one of the databases in Firebase (Firestore or Realtime Database) to store data, but then deploy the web app to a non-Firebase hosting provider.
It's also quite common for (Flutter) web apps to use Firebase Cloud Messaging to deliver push notifications and background data messages, but no other parts of Firebase.

Integrate Google\Firebase account setup in my app setup

Since my apps will rely on Firebase Realtime Database\Cloud Messaging, is there a way to integrate the initial creation of the Google account and Firebase project during my app install?

Difference between Firebase Admin SDK and Firebase Admin Web API

I want to take a decision to use Firebase Admin SDK or Firebase Admin REST API.
I need to use it in the communication from Angular/Node.js to Firebase database.
Please let me know if you can share the comparison between this two.
Thanks.
For communicating from an Angular web app with the Firebase Database, use the Firebase Web SDK.
For communicating from a server-side Node.js process with the Firebase Database, use the Firebase Admin SDK.
For communicating with the Firebase Database from a platform for which there is no SDK, use the Firebase REST API.

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