If an IdP is SAML compliant, you only need to write code once. Of course, if you also want to authz based on IdP roles, you will need to have a mapper (from you

If an IdP is SAML compliant, you only need to write code once. Of course, if you also want to authz based on IdP roles, you will need to have a mapper (from your app perms to IdP roles), but this is not because of differences in IdP