Update an existing visitor.
A unique identified for the visitor which is given by Intercom.
A unique identified for the visitor which is given by you.
The visitor's name.
The custom attributes which are set for the visitor.
{ "id": "8a88a590-e", "user_id": "123", "name": "Christian Bale", "custom_attributes": { "paid_subscriber": true, "monthly_spend": 155.5, "team_mates": 9 } }