OpenID Federation 1.0 enables trust-building between Relying Parties and OpenID Providers without direct relationships, facilitating secure OIDC/OAuth requests. Keycloak is being developed to implement OpenID Federation, providing a step-by-step guide on registering clients dynamically using this trust framework, particularly in the context of Digital Identity Wallets. The article outlines the setup of a Proof of Concept environment, detailing the roles of Trust Anchors and Intermediate Authorities in the process.