@imapotato Heya,

FusionAuth isn't really an AD/LDAP replacement. It doesn't support older protocols like RADIUS, Kerberos or even LDAP fully.

When we are talking about machine to machine communication, we are referring to the client credentials OAuth grant. You can read more about that in the links below:

https://fusionauth.io/docs/v1/tech/oauth/#example-client-credentials-grant

https://fusionauth.io/docs/v1/tech/core-concepts/entity-management