curl --request GET \
  --url https://api.olostep.com/v1/batches/{batch_id}/items \
  --header 'Authorization: Bearer <token>'

{
  "batch_id": "batch_abc123def456",
  "object": "list",
  "status": "completed",
  "items": [
    {
      "custom_id": "product-123",
      "retrieve_id": "ret_xyz789",
      "url": "https://example.com/product/123",
      "metadata": {
        "source": "catalog_sync",
        "priority": "high"
      }
    },
    {
      "custom_id": "product-456",
      "retrieve_id": "ret_abc456",
      "url": "https://example.com/product/456"
    }
  ],
  "items_count": 2
}