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HOW TO ADD A SUPPLEMENTAL FEED TO GOOGLE MERCHANT CENTER

To use a supplementary feed in the Merchant Center from Shopping Booster, you can follow this guide to add the supplemental feeds.

 

Important: Make sure to set up the Shopping Booster before following these steps. 

  1. Log in to https://merchants.google.com/
  2. Confirm you are on the correct account!

  3. Click "Settings"

     

    Screenshot 2026-05-20 at 13.35.44

  4. Click "Add-ons"


    Screenshot 2026-05-20 at 13.36.16

  5. Under Advanced data source management, select "Add"

  6. Click "Add"

  7. Now supplemental feeds will be available. Go to "Data sources"

    Screenshot 2026-05-20 at 13.38.44

     

  8. Click the "Supplemental sources" tab

     

    Screenshot 2026-05-20 at 13.38.57

  9. Click "Add supplemental product data"

  1. Insert the file URL from the Shopping Booster in ProfitMetrics

    Screenshot 2026-05-20 at 13.42.06
    Click to add the username and password to authenticate the feed:
    Screenshot 2026-05-20 at 13.42.16
  2. Scroll down to HTTP authentication. You can find these credentials in ProfitMetrics under Shopping Booster settings.
    How to Create a Supplemental Feed for PM Shopping Booster - Step 9
    After authenticating click 'continue'

  3. Choose all or only the specific languages where this feed should apply.
    How to Create a Supplemental Feed for PM Shopping Booster - Step 10
  4. Click "Create feed" - You will now see your supplemental feed in the overview.
    How to Create a Supplemental Feed for PM Shopping Booster - Step 11
  5. Navigate to your new supplemental feed and click "Update".
    Screenshot 2026-05-20 at 13.47.03
  6. Your supplemental feed will be processed and added to your products.
    The new updated Custom Columns will not be visible within Google Ads before the next sync which can take up to 24 hours after you fetched the feed.