OAuth 2.0 access token.
OAuth 2.0 ID token.
Session Transfer Token issued by Auth0 (Phase 2 CTE).
When issued_token_type equals this value, the access_token in the response
is a one-shot STT — not a usable API bearer token. Pass it to
buildSessionTransferRedirect to start the impersonation redirect.
Token type URNs for Custom Token Exchange and Session Transfer flows (RFC 8693).