Endpoint Grouping With FastEndpoints

Program.cs

using FastEndpoints;
using FastEndpoints.Swagger;

var bld = WebApplication.CreateBuilder();
bld.Services
   .AddAuthorization()
   .AddFastEndpoints()
   .SwaggerDocument(o => o.AutoTagPathSegmentIndex = 0);

var app = bld.Build();
app.UseAuthorization()
   .UseFastEndpoints()
   .UseSwaggerGen();
app.Run();

public class Administration : Group
{
    public Administration()
    {
        Configure(
            "admin",
            ep =>
            {
                ep.Description(
                    x => x.Produces(401)
                          .WithTags("administration"));
            });
    }
}

public class Login : EndpointWithoutRequest
{
    public override void Configure()
    {
        Get("/login");
        Group<Administration>();
    }

    public override async Task HandleAsync(CancellationToken c)
    {
        await SendOkAsync();
    }
}

public class Sales : SubGroup<Administration>
{
    public Sales()
    {
        Configure(
            "sales",
            ep =>
            {
                ep.Description(
                    x => x.Produces(402)
                          .WithTags("sales"));
            });
    }
}

public class GetInvoice : EndpointWithoutRequest
{
    public override void Configure()
    {
        Get("/invoice/{id}");
        Group<Sales>();
    }

    public override async Task HandleAsync(CancellationToken c)
    {
        await SendOkAsync();
    }
}

public class Reports : SubGroup<Sales>
{
    public Reports()
    {
        Configure(
            "reports",
            ep =>
            {
                ep.Description(
                    x => x.Produces(403)
                          .WithTags("sales-reports"));
            });
    }
}

public class TotalTurnover : EndpointWithoutRequest
{
    public override void Configure()
    {
        Get("/turnover/{month}");
        Group<Reports>();
    }

    public override async Task HandleAsync(CancellationToken c)
    {
        await SendOkAsync();
    }
}