confluence api change user password

[S]

I want to change user password using rest api as Confluence admin. Can you post me an example if it is possible using api. If not is there a way to do it other than GUI ?

I need this on Confluence cloud.

[Mark Snow]

Their REST API documentation in general is horrible for confluence, and next-to-non-existent for Cloud / OnDemand. 

Nothing like they have for Jira, which is far better.

I have been looking for the same thing (REST API for user/password change for Cloud), and I don't think it exists. 

Would love to be proven wrong. Currently looking elsewhere for new solutions. Literally can't believe there is any cloud product these days (nigh 2016) that isn't 100% saturated in REST API covering every aspect of control.