> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/Recommendation.UpgradeSmartShoppingCampaignToPerformanceMaxRecommendation).

The upgrade a Smart Shopping campaign to a Performance Max campaign recommendation.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/resources/recommendation.proto)

| Fields ||
|---|---|
| ## `merchant_id` | `int64` Output only. ID of Merchant Center account. |
| ## `sales_country_code` | `string` Output only. Country whose products from merchant's inventory should be included. |