How to impersonate another user in a Process via Oauth

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Hi experts,

Is there a way I can set a user in a process instance instance when calling integration via OAuth client credentials?

In this OAuth flow I don't have the client crendentials, only the client_id and client_credentials from the OAuth IDCS Application.

But process needs a specific user to start the process instance.

I don't have the specific client credentials because it is an integration from a mobile that I don´t have access to the user password, only to the user id.

I've read an interesting article about oauth delegation patterns in https://www.scottbrady91.com/OAuth/Delegation-Patterns-for-OAuth-20