/// <summary>
/// Gets an eSales product key from an EPiServer id.
/// </summary>
/// <param name="entry"></param>
/// <returns></returns>
public static string ProductKey(Entry entry)
{
return(entry == null
? string.Empty
: AttributeHelper.CreateKey(AppConfig.UseCodeAsKey ? entry.ID : entry.CatalogEntryId.ToString(CultureInfo.InvariantCulture), GetUserLang()));
}