update
Applies all optional OIDC fields from oidcJsonConfig to this OidcClientConfig.
Mandatory fields (clientId, discoveryEndpoint, scopes, redirectUri) are set by each JSON factory independently. This function handles every optional field: display, par, loginHint, state, nonce, prompt, uiLocales, acrValues, signOutRedirectUri, refreshThreshold, additionalParameters, and the openId endpoint-override sub-object.
Parameters
oidcJsonConfig
Parser wrapping the oidc sub-object of the top-level JSON config.