AI-generated Key Takeaways
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          Provides information on upgrading a Smart Shopping campaign to a Performance Max campaign. 
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          Includes fields for merchant_idandsales_country_code.
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          merchant_idis an output-only integer field.
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          sales_country_codeis an output-only string field indicating the country for product inventory.
The upgrade a Smart Shopping campaign to a Performance Max campaign recommendation.
| Fields | |
|---|---|
| 
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 Output only. ID of Merchant Center account. | 
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 Output only. Country whose products from merchant's inventory should be included. |