An OAuth Client ID Metadata Document (SEP-991) a client hosts at its
HTTPS-URL client_id. The authorization server fetches this document to
learn the client's metadata (name, redirect URIs, auth method) without any
prior registration. clientId MUST equal the document's own URL.
Serialize to the JSON document hosted at the client_id URL. client_id
and redirect_uris are always present (per SEP-991 minimum fields);
optional fields are emitted only when set.
An OAuth Client ID Metadata Document (SEP-991) a client hosts at its HTTPS-URL client_id. The authorization server fetches this document to learn the client's metadata (name, redirect URIs, auth method) without any prior registration. clientId MUST equal the document's own URL.