WPetition/Submission.Api/Program.cs

using System.Configuration;
using Ashi.MongoInterface;
using Ashi.MongoInterface.Service;
using Microsoft.AspNetCore.RateLimiting;
using Microsoft.Extensions.Options;

var builder = WebApplication.CreateBuilder(args); 

// Add services to the container.
builder.Services.Configure<MongoDbSettings>(builder.Configuration.GetSection("MongoDbSettings"));

builder.Services.AddSingleton<IMongoDbSettings>(serviceProvider =>
    serviceProvider.GetRequiredService<IOptions<MongoDbSettings>>().Value);

builder.Services.AddScoped((typeof(IMongoRepository<>)), typeof(MongoRepository<>));

builder.Services.AddMemoryCache();

builder.Services.AddControllers();
// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
builder.Services.AddOpenApi();

// Add rate limiting
builder.Services.AddRateLimiter(options =>
{
    options.AddFixedWindowLimiter("SignPetitionPolicy", limiterOptions =>
    {
        limiterOptions.PermitLimit = 3;
        limiterOptions.Window = TimeSpan.FromMinutes(1);
        limiterOptions.QueueProcessingOrder = System.Threading.RateLimiting.QueueProcessingOrder.OldestFirst;
        limiterOptions.QueueLimit = 0;
    });
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.MapOpenApi();
}

app.UseHttpsRedirection();

app.UseRateLimiter();

app.UseAuthorization();

app.MapControllers();

app.Run();