How to handle multiple firebase projects server side?

Question

I have SaaS application that needs 4 mobile apps (built in Flutter):

• iOS/Android version of a customer app
• iOS/Android version of admin app

Initially, I was thinking of having a single Firebase project where all 4 apps reside, but I have read that this may not be the best way to handle things (Firebase FCM, multiple apps in the same firebase project).

I have no issues breaking it up to two Firebase projects, one for the customer app and one for the admin app, but how do I then handle this server side when my API is to send pushes?

Server is using .Net, and right now I am using Global.asmx to create the firebase instance:

protected void Application_Start(object sender, EventArgs e)
{
    // Enable firebase
    FirebaseApp.Create(new AppOptions() { Credential = GoogleCredential.FromFile(HostingEnvironment.MapPath(@"~/App_Data/customerapp-245105.json")).CreateScoped("https://www.googleapis.com/auth/firebase.messaging") });
}

But this will only enable the customer app? How do I also create the admin app?

Im assuming that I can't simply do:

protected void Application_Start(object sender, EventArgs e)
{
    // Enable firebase
    FirebaseApp.Create(new AppOptions() { Credential = GoogleCredential.FromFile(HostingEnvironment.MapPath(@"~/App_Data/customerapp-245105.json")).CreateScoped("https://www.googleapis.com/auth/firebase.messaging") });

    FirebaseApp.Create(new AppOptions() { Credential = GoogleCredential.FromFile(HostingEnvironment.MapPath(@"~/App_Data/adminapp-244405.json")).CreateScoped("https://www.googleapis.com/auth/firebase.messaging") });
}

And, how do I tell the instances apart when calling them in the webservice? As the first instance would be used when sending pushes to customers, and the second for admin?

Answer 1

Each FirebaseApp instance must be given a unique name. You can look up instances by their names. See the examples in the documentation: https://firebase.google.com/docs/admin/setup#initialize_multiple_apps