You can go to Nabu's settings, and go to Shopify market to get Data Feed URLs for countries that are associated with custom domains
Follow the below steps to create a feed for countries that are using custom domains in your Shopify market:
1. Go to the Settings tab, and click on Shopify Market
2. You can view all your market settings here, and market details like primary domain, subfolders, etc.
3. For markets that are using any custom domain or subdomain other than your primary domain. For such countries, you will be able to view Data Feed URLs as shown below:
4. Click on Copy to Clipboard to copy the generated URL and use it as a data source in Google Merchant Center to create a new feed.
Note: The Update Feed and Push product buttons will be disabled for countries that are associated with domains other than your primary domain. For such countries, use the Data Feed URL as mentioned above.