Hi @kfwebmaster,
Yes, it is possible to activate a test or sandbox mode on staging and development environments to avoid polluting your Google Shopping feed with unnecessary data.
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For staging sites, as long as you don’t upload the feed URL to your merchant account or send the feed to Google Merchant Center using the Content API, your production Google Shopping feed won’t be affected.
?For development environments, you should not use the existing feed that is already connected to your Google Merchant Center. However, you can create a new feed specifically for testing and development purposes to keep your production feed clean and accurate.
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This way, you can ensure that your Google Shopping feed remains unaffected by your staging and development activities while you work on testing and improvements.
I hope this informations clears your confusion.
Best Regards,