Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using VRChat.API.Extensions.Hosting;

namespace VRChat.API.UnitSample.AspNetCore
{
    public class Startup
    {
        public Startup(IConfiguration configuration) =>
            Configuration = configuration;

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddVRChat(); // Registers the default IVRChat to the service collection
            services.AddVRChat("OtherUser", Configuration.GetSection("VRChat")); // Registers an "OtherUser" IVRChat to the service collection

            services.AddControllers();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IVRChatClientFactory factory)
        {
            if (env.IsDevelopment())
                app.UseDeveloperExceptionPage();

            app.UseRouting();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

            factory.LoginAllClientsAsync().Wait(); // This will try to login all the VRChat clients
        }
    }
}