Bearer authentication of the form Bearer <token>, where token is your auth token.
ID of a counterpart whose contact you want to update. Only organization-type counterparts can have contacts.
Indicates whether this contact is the default one. The default contact is used to fill in the counterpart’s contact details when you create invoices and quotes for this counterpart.
To select another contact as the default one, use POST /counterparts/{counterpart_id}/contacts/{contact_id}/make_default.
The title or honorific of a contact person. Examples: Mr., Ms., Dr., Prof.