The rules for running Google Shopping campaigns in the US are different from the way these campaigns run in Europe, since the anti-competition laws that allow multiple CSS partners to compete in European territories are not in place in the USA.
Instead, to run CSS through Grow’s affiliate channels, we recommend using a preferred partner and designating them your CSS partner of choice via the Google Merchant Centre.
Please get in touch with Grow Support for details of our preferred US CSS partners, and we can guide you on the next steps.