Program.cs

using POSTxns.Hubs;
using POSTxns.Service;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();
builder.Services.AddSignalR();
builder.Services.Configure<RabbitMQOptions>(
    builder.Configuration.GetSection(RabbitMQOptions.RabbitMQ));

builder.Services.Configure<POSTxnMonitorOptions>(
    builder.Configuration.GetSection(POSTxnMonitorOptions.POSTxnMonitorApp));
    
builder.Services.AddSingleton<POSTxnsHub>();
builder.Services.AddSingleton<IRabbitMQService, RabbitMQService>();
builder.Services.AddControllers();

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();
app.MapHub<POSTxnsHub>("/posHub");
app.MapControllers();
app.Run();