Firebase Messaging Test

FirebaseTest.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FirebaseAdmin" Version="2.3.0" />
  </ItemGroup>

</Project>

Program.cs

using FirebaseAdmin;
using FirebaseAdmin.Messaging;
using Google.Apis.Auth.OAuth2;

FirebaseApp.Create(new AppOptions()
{
    Credential = GoogleCredential.FromFile("service-account.json"),
});

var registrationTokens = new List<string>()
{
    "REGISTRATION_TOKEN_1",
};
var message = new MulticastMessage()
{
    Tokens = registrationTokens,
    Data = new Dictionary<string, string>()
    {
        { "title", "Notification title test" },
        { "subtitle", "Notification subtitle test" },
    },
};

var response = await FirebaseMessaging.DefaultInstance.SendMulticastAsync(message);

Console.WriteLine($"{response.SuccessCount} messages were sent successfully");