Resetting expired passwords?

[caglarturali]

I'm creating a webkit2-greeter theme for an organization and one of the requirements is being able to reset expired passwords. I was told that authenticate method of the API will/should do the trick in case of a password expiry by acting like a sequential input (new password - new password again) but so far, I have not encountered a document or mechanical example that mentions such a functionality. So, is that possible to reset expired passwords through webkit2-greeter API? If so, how?