{
  "upsells": [
    {
      "id": "upsell_abc123",
      "offerTitle": "VIP Upgrade",
      "type": "upsell",
      "enabled": true,
      "offers": [
        {
          "productId": "prod_123",
          "variantId": "var_123",
          "priceId": "price_123"
        }
      ],
      "triggers": [
        {
          "type": "any",
          "productId": null
        }
      ]
    }
  ],
  "total": 1
}

{
  "message": "<string>",
  "code": "<string>",
  "issues": [
    {
      "message": "<string>"
    }
  ]
}