Conformance profiles for OPs and RPs implementing Form Post Response Mode are now ready for you to test and use. These are in the pilot phase and so certifications using them are currently available to any OpenID Foundation member for free. If you aren’t a member and want to certify during the pilot phase, you can join at https://openid.net/foundation/members/registration.
See the OpenID Certification page for more information about the OpenID Certification program and to see the current set of certified implementations. Any questions about OpenID Certification can be sent to firstname.lastname@example.org.