Google switched from the Inventory API to the Supplemental feed in February 2020.

This feed allows an hourly update of offers for the Google Shopping and Google Shopping Display Ads services. It has to be used along with the Google API - Services feed in Lengow.

How to do it?

1. Create the supplemental feed in your Google Merchant Center account

• Select the sub-account where your Google API feed is sent from Lengow
  The Merchant ID at the top of your browser must be the same as the one entered in the "Settings" tab of your Google API feed on Lengow.

• Click on "Products" > click on "Feed" > at the "Supplemental feed" level, click on "Add supplemental feed"

• Name this new feed, then select "Content API"and click on "Continue"
  
  
  
  
  • If you have several main feeds, once you have selected "Content API", select the "country/language" combination that corresponds to the feed in your Lengow account (ex: "France, English" for your Shopping Actions FR feed in English in Lengow). You have to select only one combination. If you select more than one combination at a time, this will produce errors.
    
    
    
    
• Then click on "Create feed"
• Verify that this feed has been added to your Google Account, that its format is "Content API" and that the country/language combination is correct.
  
  
• Retrieve the id of this new feed by clicking on the name of the supplemental feed and copy this id (this id is composed of a sequence of numbers).
  
  

2. Fill in the supplemental feed ID in your Lengow account

In your Lengow account:

• Go to "Channels" tab
• Select your Google API feed (the one mapping with the country/language feed you just created, e.g.: FR)
• In the "Settings" tab, go to the "Settings" step
• On the "Login" tab, click on "Edit"
  
  
  
• Fill in the identifier in the "Supplemental Feed ID" field
  
  
  
  Make sure to leave the Merchant ID unchanged in the field above!

Special cases:

Your Lengow account contains multiple Google API feeds

Repeat steps above as many times as you have Google API feeds in Lengow.

Your GMC contains multiple Google API feeds

In your Google Merchant Center, you'll have as many supplemental feeds as there are lines associated with the "Content API" format at the top.

You are using GMC Next

In Google Merchant Center Next, the supplemental product data is now part of "Data sources" in the Settings menu (cog icon).

To use supplemental data sources, go to "Add-ons" and add "Advanced data source management".

Note: If you already had a supplemental feed in the classic Merchant Center, this add-on is already activated automatically in your Google Merchant Center Next.