API endpoints for process visibility and additional linked units

Hello,

I would like to create processes using the API and automatically configure the same visibility settings that are available in the UI.

I already searched the API documentation, but could not find how to set the users/parties under "Who can see this process" / "Shared with". I also could not find how to add multiple affected units to one process.

Could you please tell me which endpoints should be used to:

add or remove users/parties from process-level visibility
add or remove additional linked units on a process

Thanks for the help.

Best regards,
Till