Presumably, Kia will give you carte blanche access to their service document archives for 72 hrs for $19. That's a smoking deal if (and only if) the Niro service manual is there. Unfortunately, Kia gives us no clue what documents may or may not be there before we pay. Has anybody used the website and did you find the Niro service manual there?
https://kiatechinfo.snapon.com/default.aspx
https://kiatechinfo.snapon.com/default.aspx