SessionExtensions.cs

public static class SessionExtensions
{
    public static void AddSessionWithStartSession(this IServiceCollection services)
    {
        services.AddSingleton<ISessionStore, DistributedSessionStoreWithStart>();
        services.AddDistributedMemoryCache();
        services.AddSession(options =>
        {
            options.Cookie.IsEssential = true;
        });

        services.AddSingleton<IStartSession>(s =>
        {
            var startSession = new StartSession();

            // Add here other actions if more funcionality is needed for session start
            startSession.AddToStartSession(s.GetRequiredService<IUrlRefererService>().SetSessionStartRefererUrl);

            return startSession;
        });
    }
}