Bulk Create Contacts

Use the Bulk Create Contacts endpoint to create up to 100 contacts in a single API request. This endpoint supports intelligent deduplication and returns separate arrays for newly created and existing contacts.

Important: This endpoint creates new contacts but does NOT update existing ones (except for placeholder contacts from email imports). Existing contacts that match the criteria will be returned in the existing_contacts array without modification.

To update existing contacts, use the Bulk Update Contacts endpoint.