ProductTypeFactorySupport.cs

    public delegate string GetSkuDelegate();
    
    public interface IDateTimeWrapper
    {
        DateTime GetCurrentDateTimeUtc();
    }

    public interface IProductFactory
    {
        Product Create(string productName);
    }

    public class DateTimeWrapper : IDateTimeWrapper
    {
        public DateTime GetCurrentDateTimeUtc() => DateTime.UtcNow;
    }
    
    public class UserAccessor
    {
        private readonly IHttpContextAccessor _ctx;
        public UserAccessor(IHttpContextAccessor ctx)
        {
            _ctx = ctx;
        }

        public IUser GetUser()
        {
            var userName = _ctx.HttpContext.User.Identity?.Name;
            var userIdValue = _ctx.HttpContext.User.Claims.FirstOrDefault(c => c.Subject?.Name == "UserId")?.Value ?? string.Empty;
            var userId = int.Parse(userIdValue);
            return new User(userId, userName);
        }

        private record User(int UserId, string Name) : IUser;
    }