OptionalclientOptionalclientClient secret; only for servers whose token endpoint demands it.
The code returned to the redirect URI by the authorization server.
OptionalcodePKCE verifier when the authorization request carried a challenge.
OptionalerrorPrefix of thrown errors' name (see FoundationApiError); defaults to 'Foundation'.
OptionalfetchMust byte-match the redirect_uri sent on the authorization request.
OAuth2 token endpoint, from the server's /auth discovery document.
Public client id, when the server requires one.