{
    "protocol": {
        "id": "saml2",
        "links": {
            "identity_provider": "http://example.com/identity/v3/OS-FEDERATION/identity_providers/ACME",
            "self": "http://example.com/identity/v3/OS-FEDERATION/identity_providers/ACME/protocols/saml2"
        },
        "mapping_id": "xyz234"
    }
}