OptionalauthorizationOptionalchallengeOptionalcheckpointResponse when a request got a checkpoint error (challenge_required). Set automatically by the error router.
Random lifetime in ms for clientSessionId rotation (20min–24h). Generated once per device.
OptionaldsOptionaligOptionalnavOptionalpasswordOptionalpasswordRandom lifetime in ms for pigeonSessionId rotation (20min–24h). Generated once per device.
OptionalregionOptionalrurOptionalshbidOptionalshbtsOptionalxPre-computed x-meta-usdid HTTP header value. Set by postUsdidRegistration and
reused byte-identical on every subsequent request until the next USDID re-register.
Not persisted across processes by default (the signature embeds a timestamp).
Optionalx
Response when challenge data was purposefully fetched from the checkpoint URL. Set by challenge.route().