You can reprocess Google Shopping content API by using a supplement feed.
- Go to Google Merchant Center
- Products
- All Products
- Click on the download icon
- Open the zip file
- Change the .tsv file to .csv
- Open the file using your favorite spreadsheet editor and copy the ID column (it can also be called item_id, if so change the header from item_id to id).
- Go to Google Sheets
- Paste the ID column contents
- Go back to Google Merchant Center > Products > Feeds > click on add supplement feed
- Add your feed name (can be anything) and select Google Sheets, then continue.
- Click on Select an existing Google spreadsheet
- Locate your file and save, now choose your content api and continue.
- Now that you have created the connection, click on the supplement feed you just created, and click on “fetch now”.
