Trados Studio TM matching

Working on a Trados Studio plugin that connects with a remote MT source and want to filter the segments that are translated to just those that don't match a TM entry.  I have a Sdl.LanguagePlatform.TranslationMemory.TranslationUnit and I understand that ConfirmationLevel and Origin may be useful in determining if a TU is TM-matched, but I have not been able to find SDK documentation on Sdl.LanguagePlatform.TranslationMemory namespace though have seen Sdl.LanguagePlatform.TranslationMemoryApi namespace.  Would like more details on how these related to different matching percentages.

Has anyone seen the Sdl.LanguagePlatform.TranslationMemory.TranslationUnit namespace details?

Thanks.