Optional flags when starting a Journey from a backchannel (transactional)
redirect URI.
Remarks
verificationUri is deliberately absent: the native backchannel entry
points (SDKS-5156 iOS / SDKS-5157 Android) support only forceAuth and
noSession. Both flags default to false, matching native behavior.
Optional flags when starting a Journey from a backchannel (transactional) redirect URI.