Need api details

Hi
I am doing analysis on okta integration with my application using rest api.
My analysis includes user and session management. Can you please point me to the API references for the below functionalities?

set User Attributes
get User Policy
lock User
auto Generate Password
get Challenge Questions
delete Challenge Question
update Otp Device
reset Otp Devices
is User Exists
Orchestration

These should help

https://developer.okta.com/docs/reference/
https://developer.okta.com/code/rest/
https://developer.okta.com/docs/reference/api-overview/
https://developer.okta.com/docs/