Returns the full definition of a conversation segment including its predicate filters.
Returns 404 if the segment does not exist for your app, and 403 if the segment is private
and not visible to your account.

Listing the conversations of a segment

This resource does not return its conversations. To fetch the conversations belonging to a segment, call the
conversations list endpoint with the segment_id filter: GET /conversations?segment_id={segment_id}. It
accepts the same filters and pagination as any other conversation list.