public class RoomsAuthProvider : BasicAuthProvider
{
    public RoomsAuthProvider(AppSettings appSettings) : base(appSettings)
    {
    }

    public RoomsAuthProvider()
    {
    }

    public override bool TryAuthenticate(IServiceBase authService,
        string userName, string password)
    {
        return true;
    }

    public override IHttpResult OnAuthenticated(IServiceBase authService,
        IAuthSession session, IAuthTokens tokens,
        Dictionary<string, string> authInfo)
    {
        session.FirstName = "some_firstname_from_db";
        return base.OnAuthenticated(authService, session, tokens, authInfo);
    }
}

public override void Configure(Funq.Container container)
{
    container.Register<ICacheClient>(new MemoryCacheClient());

    Plugins.Add(new AuthFeature(() => new AuthUserSession(),
        new IAuthProvider[]
        {
            new RoomsAuthProvider()
        }));

    Plugins.Add(new ServerEventsFeature());
}

var client = new ServerEventsClient("http://localhost:1337/", "home")

var authResponse = client.Authenticate(new Authenticate
{
    provider = "RoomsAuthProvider",
    UserName = "test@gmail.com",
    Password = "p@55w0rd",
    RememberMe = true,
});