curl --request POST \
  --url https://api.criteo.com/2025-07/retail-media/balances/{balance-id}/campaigns/append \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": [
    {
      "attributes": {},
      "id": "<string>",
      "type": "<string>"
    }
  ]
}
'

{
  "data": [
    {
      "attributes": {},
      "id": "<string>",
      "type": "<string>"
    }
  ],
  "errors": [
    {
      "code": "<string>",
      "detail": "<string>",
      "instance": "<string>",
      "source": {},
      "stackTrace": "<string>",
      "title": "<string>",
      "traceId": "<string>",
      "traceIdentifier": "<string>"
    }
  ],
  "metadata": {
    "currentPageIndex": 123,
    "currentPageSize": 123,
    "nextPage": "<string>",
    "previousPage": "<string>",
    "totalItemsAcrossAllPages": 123,
    "totalPages": 123
  },
  "warnings": [
    {
      "code": "<string>",
      "detail": "<string>",
      "instance": "<string>",
      "source": {},
      "stackTrace": "<string>",
      "title": "<string>",
      "traceId": "<string>",
      "traceIdentifier": "<string>"
    }
  ]
}