Multifeed Google Shopping Feed

This is the best app for feeds on Shopify. It has everything needed to optimize feeds properly - all Google attributes are customizable, and you can use advanced expressions to extract data from your products automatically.

It supports multiple countries and integrates with Global-e-service and others, such as reviews aggregators like Yotpo. You can create supplemental and primary feeds in tsv, csv, xml or send it via API to GMC.

Support is friendly, and responsive and quickly solved 2 complex issues for me. I highly recommend this app!