curl --request PUT \
  --url https://api-next.dealroom.co/api/landscapes/{id}/entities \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "entity_ids": [
    12345,
    67890,
    11223,
    44556
  ]
}
'

{
  "data": {
    "id": 123,
    "ecosystem_id": 123,
    "name": "<string>",
    "description": "<string>",
    "sort_order": 123,
    "entities": [
      {
        "id": 123,
        "name": "<string>",
        "tagline": "<string>",
        "image": "<string>"
      }
    ]
  }
}