com.sun.identity.agents.app.username defines a user with permission to read the OpenSSO Enterprise configuration data; by default, UrlAccessAgent.
com.iplanet.am.service.password specifies the password of the user with permission to read OpenSSO Enterprise configuration data.
com.iplanet.am.service.secret specifies the encrypted password for the user defined in the com.sun.identity.agents.app.username property; for example, AQIC24u86rq9RRZGr/HN25OcIuO6w+ne+0lG.
See Setting Up a Client SDK Identity for additional information.