How can I remove a user's space permissions by rest api?

[Ronaldo Huang]

Any document available?

[Daniel Ebers]

Hi Ronaldo,

there is an open Suggestion with Atlassian to get this option in the future:
https://jira.atlassian.com/browse/CONFSERVER-44329

You could upvote and watch the Suggestion. Likeliness is then higher that the Suggestion will get the needed traction in the future.

Please also note that there are some workarounds and hints in the linked Suggestion. None of them is tested by me so you would need to wait for more feedback here or just give it a go :)
In any case it can make sense to test first on a lower environment (non-production copy of your production data).

Cheers,
Daniel