mutation ChangeItem($request: ChangeItemCommandRequestInput!) {
  ChangeItem(request: $request) {
    item {
      id
      productGroupId
      shippingClassId
      manufacturerId
      taxClassId
      identifiers {
        sku
        amazonFnsku
        gtin
        manufacturerNumber
        isbn
        tariccode
      }
    }
  }
}

{
  "request": {
    "itemId": "id"
  }
}

{
  "data": {
    "ChangeItem": {
      "item": {
        "id": "id",
        "productGroupId": "id",
        "shippingClassId": "id",
        "manufacturerId": "id",
        "taxClassId": "id",
        "identifiers": {
          "sku": "string",
          "amazonFnsku": "string",
          "gtin": "string",
          "manufacturerNumber": "string",
          "isbn": "string",
          "tariccode": "string"
        }
      }
    }
  }
}