HubSpot Lifecycle and Lists Overview Move contacts through the HubSpot funnel and maintain list integrity in a production system. This is not a setup walkthrough — it is the code your marketing-ops integration runs when a lifecycle stage update would silently regress a Customer back to Subscriber, when a dynamic list's criteria change orphans members who qualified last week, when a static list import references contacts that were deleted from the portal, when an external lead-scoring model creates a second source of truth that fights HubSpot's native scoring, when a list-membership webhook fi…