Program.cs

using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.Authority = "https://accounts.google.com";
        options.Audience = "1013971797711-6ckmc0bv66dlf05fj804van7lkedf239.apps.googleusercontent.com";
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = "https://accounts.google.com",
            ValidAudience = "1013971797711-6ckmc0bv66dlf05fj804van7lkedf239.apps.googleusercontent.com",
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("some-random-keys"))
        };
    });

    builder.Services.AddAuthentication(options =>
    {
        options.DefaultAuthenticateScheme = GoogleDefaults.AuthenticationScheme;
        options.DefaultChallengeScheme = GoogleDefaults.AuthenticationScheme;
    })
        .AddGoogle(options =>
        {
            options.ClientId = "1013971797711-6ckmc0bv66dlf05fj804van7lkedf239.apps.googleusercontent.com";
            options.ClientSecret = "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";
        });

//Add cors
builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(builder =>
    {
        builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod();
    });
});

builder.Services.AddControllers()
    .AddJsonOptions(options =>{
        options.JsonSerializerOptions.PropertyNamingPolicy = null;
        options.JsonSerializerOptions.WriteIndented = true;
    });

//HTTP CLIENT
builder.Services.AddHttpClient();
builder.Services.AddLogging();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseCors();
app.UseAuthentication();
app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();