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Use hubspot.upsertContacts to batch create or update HubSpot contacts by unique property.
automations/hubspot-upsert-contacts.automation.ts

Inputs

Provide 1–100 contacts. Each row names its unique idProperty, identifier id, and writable properties. Optional second argument { account } selects a named HubSpot binding.

Output

Returns the created or updated contacts. Replaying the same unique identifiers is safe. If HubSpot rejects any row, the action fails instead of returning an incomplete result.