Extract the exp claim (token expiry, unix seconds) from an introspection response (RFC 7662 2.2 / RFC 7519 4.1.1). Returns 0 when absent or not a number, signalling "no known expiry".
Extract the exp claim (token expiry, unix seconds) from an introspection response (RFC 7662 2.2 / RFC 7519 4.1.1). Returns 0 when absent or not a number, signalling "no known expiry".