need the SystemCustomerAttributeNames class
var existingCouponCodes = EngineContext.Current.Resolve<IGenericAttributeService>().GetAttributeAsync<string>(SystemCustomerAttributeNames.DiscountCouponCode,
genericAttributeService).GetAwaiter().GetResult();
so where i can find SystemCustomerAttributeNames in version 4.6? or it have alternative?
thanks in advance
hussainy