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Parameter Purpose
msdynmkt_signaluserauthid The contact or lead GUID — the "who" of the signal. This is the field Customer Insights — Journeys uses to resolve the audience record.
msdynmkt_profileid Also the contact or lead GUID. Used by the journey to pass per-contact context to downstream actions (Power Automate flows, branching conditions).
msdynmkt_signaltimestamp When the event actually happened, in UTC. This is what ends up in interaction reporting.
msdynmkt_signalingestiontimestamp When the signal was ingested into the platform, in UTC. Usually DateTime.UtcNow at the moment of the call.
msdynmkt_bindingid Optional but important. Binds this trigger to a specific instance of a journey. Without it, the trigger acts on every journey instance the contact is currently in.