Used to get a contact. ...The first matching contact is returned by the API....Example for how to find a contact by email address:
Find by email address /api/v1/contact?...email=ben@example.com
Example for how to find a contact by mobile phone:
Find by mobile phone /api/v1/contact?
Attempts to find and return a contact using the email address or mobile number....If a contact is not found, a new contact is created....This API is similar to the Get a Contact API, but creates a new contact if a contact is not found.
Add Contacts to a Segment
Adding contacts is accomplished by either including an array of contact unique ids (dsid) or passing in a search query which will add all contacts that match the specified criteria.