HubSpot Product Event Sync Overview Push backend product events into HubSpot custom contact and company properties — the core pattern of a Segment-style integration, built directly against the HubSpot CRM API without a CDP middleman. This is not a tutorial on HubSpot setup. It is the code your data pipeline runs at 3am when a product launch generates a 10K events/minute storm, when a network hiccup causes the same batch to be retried and your "total sessions" counter doubles, when a property type mismatch silently truncates numbers, and when your contact lookup fails because a new user signed…