I just answered a question in this forum about how to use 'assumeUser' in the API
https://community.smartsheet.com/discussion/comment/409154/#Comment_409154
I provided a code example for Javascript, and I wanted to refer to the API documentation but found it lacking with the only reference being
https://smartsheet.redoc.ly/#section/API-Basics/Assume-User
but there are no examples of how to do this. I think I learned about 'assumeUser' in the 1.x version of the API documentation.
Thank You