- Go to API Connections → Create New API Connection → Google Shopping.
- Pick the data source and the Merchant Center account, map the fields in Settings and click Build.
- Set the Schedule. Each run shows the number of updated and deleted products in Last Sync Changes.
Remove Uploaded Products takes everything this connection sent out of Merchant Center again.
Most accounts do fine with a Google Shopping feed export fetched by Merchant Center; use the API connection when you need near-real-time updates of stock and prices.