Not sure which API you're looking to use, to my knowledge, TotalLMS has more than one.
I haven't used TotalLMS for years, but I do have some old SCORM-related documentation from around 2004-2005, see attached. What's confusing is that SumTotal (the company) has acquired many smaller LMS products over the years and incorporated it into their SumTotal product line. For TotalLMS, the underlying system used to be called "Aspen".
Knowing SumTotal's reluctance to update their codebase, the info in this doc is probably still accurate.
Hope it helps