[keycloak-user] Client Credential Flow With Service User

Hi all, I have a web app that I need to secure in an non-interactive way and there's only a couple of users that have permission to use this client and I want validate them without going through a login screen. For now the only plausible flow I can think of is the client credential flow but it does not incorporate a user, I there a better way to handle this if so how? Thank you and regards, Yasiru.