curl --request GET \
  --url https://api.open.cx/contacts/segments/{segment_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "name": "<string>",
  "description": "<string>",
  "definition": {
    "or": [
      {
        "and": [
          {
            "type": "<string>"
          }
        ]
      }
    ]
  },
  "created_at": "<string>",
  "updated_at": "<string>"
}