OpenStack SAML Integration and Application Cred, CLI usage

Hello I want to do SAML integration in OpenStack keystone. How can SAML integration be done? How can I use Application credential and OpenStack CLI with SAML-OpenStack integration? Environment version openstack:stein keystone: 15.0.1-0ubuntu1~cloud0 keystone federation: SAML Authentication Flows: SAML2.0 WebSSO Apache authentication method: Mellon