Subscribe User to Thread with API

I want to be able to subscribe a user to a thread. From looking at the rest api here (https://community.telligent.com/community/11/w/api-documentation/64665/subscribe-forum-thread-rest-endpoint) it shows that I can subscribe to a thread but does not allow a userId or any indication of a user. This leads me to believe that it's based off the user-token passed in the header.

Is there a way to subscribe an arbitrary person to a thread using a userId? Or is there a way to get the user-token for a person based off a user-id?

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