# description
Part of the Realtime API (sdks/spec/realtime.json). A short-lived, single-use token that authorises exactly one Realtime connection. Exists because EventSource cannot set headers: without it a browser would have to put a long-lived API key in a query string, where proxies log it and browser history keeps it. Inherits the scope of the credential that minted it and can never exceed it.

# properties.token.description
The value to pass as ?token= on the Realtime connection. Burns on first use.

# properties.expiresAt.description
When the token stops being accepted, in Unix epoch milliseconds (UTC).