As of PicketLink v2.1, the ServiceProviderAuthenticator is the preferred Service Provider configuration to the deprecated Section 13.5.4.4.8, “SPPostFormAuthenticator” , Section 13.5.4.4.6, “SPRedirectFormAuthenticator” , Section 13.5.4.4.7, “SPPostSignatureFormAuthenticator” and Section 13.5.4.4.5, “SPRedirectSignatureFormAuthenticator” .