Track Event

Record a customer event for a project. Requires the audience:write permission. Contact resolution is consent safe: profile fields may update, subscription status never changes. Send an Idempotency-Key header (or a body dedupeKey) for replay safety; without either, every call stores a distinct event. Events carrying identifiers.externalOrderId and a numeric properties.value are recorded as conversions attributed to the last email the contact clicked within five days.