MFA for certain operations in app

We’re using Okta CIAM for our site and had a question on how to trigger MFA after someone logs in…for example…lets say we want to trigger an MFA when someone wants to do a specific operations like change their address after they have successfully logged in.

Whats the best way to perform this?

Looking at the documentation (unsure if this is the right one). I see that one can trigger MFA(Factors | Okta Developer). But when the user successfully MFA’s and then submits their address change…how does the backend know that the MFA was successful or completed? Is there a state we can track after a user has logged in or something? Or would the backend need to manage this state somehow?