Startup.cs

using FirebaseAdmin;

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Initialize the Firebase Admin SDK
        FirebaseApp.Create();
        services.AddMvc();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseMvc();
    }
}