Before you can make supplemental feed calls with the Content API, you have to create a supplemental feed in Merchant Center. Follow the instructions in Create a feed and make sure you select Content API as the feed source. However, the primary feed that you modify with the supplemental feed can use any source, including Google Sheets, scheduled fetch, direct upload, or Content API.
Retrieve IDs for supplemental feeds
After creating a supplemental feed, retrieve the feedId in Merchant Center so
that you can use it to make Content API calls.
To retrieve a feedId, follow these steps:
- In Merchant Center, select Products > Feeds.
- In the Supplemental feeds section, click the feed name, then the Settings tab.