1.Can we use ldap service similar to okta for logging into the policy manager, developer portal. Also manage user access from ldap service i.e determining whether the user is admin or developer.
Answer : yes, LDAP users can be used to login to the Portal
Login on Policy Manager use Internal identity , but it can configure using ldap also
As far as accessing Policy Manager via ldap credentials you can take a look at the following which goes over how to accomplish this.
From the portal side of things, you can take a look at the following which goes over adding an ldap authentication scheme:
2.Can we use ldap service instead of using ssgconfig for logging into gateway server.
Answer : yes ,LDAP Idp is designed for users who wish to use an existing LDAP server to authenticate requests to the Layer7 API Gateway services/API.
to use LDAP Idp you would to see the documentation available.