A Person can also be tracked/linked by a Mobile Directory Number (MDN). This alternate identifier is sufficient in the short-term, but it is not an ideal long-term identification method because mobile numbers can be changed, returned, ported, and recycled.
Associating Person Records
To clear a String custom field of its value, send null.
To clear a date custom field of its value, send null.
Object with :id and :name.
An array of Objects, with each Object having the content of a Single Select.