curl --request GET \
  --url https://api.box.com/2.0/shield_information_barrier_segment_members \
  --header 'Authorization: Bearer <token>'

{
  "limit": 1000,
  "next_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVii",
  "entries": [
    {
      "id": "11446498",
      "type": "shield_information_barrier_segment_member",
      "user": {
        "id": "11446498",
        "type": "user"
      },
      "shield_information_barrier": {
        "id": "11446498",
        "type": "shield_information_barrier"
      },
      "shield_information_barrier_segment": {
        "id": "432554",
        "type": "shield_information_barrier_segment"
      },
      "created_at": "2020-06-26T18:44:45.869Z",
      "created_by": {
        "id": "11446498",
        "type": "user"
      },
      "updated_at": "2020-07-26T18:44:45.869Z",
      "updated_by": {
        "id": "11446498",
        "type": "user"
      }
    }
  ]
}