curl --request POST \
  --url https://api.example.com/concat/related-items-batch \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "slugPairs": null,
  "languageID": 1,
  "editionIDs": [
    1,
    2,
    3,
    4,
    5
  ],
  "page": 1,
  "pageSize": 10
}
'

{
  "success": true,
  "data": "<unknown>"
}