Ortto People / Contacts API
Create or update one or more people (merge), retrieve people by query or by IDs, archive, delete, restore, and manage subscriptions and custom fields, with configurable merge strategies.
Documentation
Documentation
https://help.ortto.com/a-257-create-or-update-one-or-more-people-merge
APIReference
https://help.ortto.com/a-250-api-reference