Google AdWords and Product Listing Ads campaigns
To list your products on the Google Shopping website and in organic Google searches, your products must be successfully published and you must set up a Product Listing Ads campaign using Google AdWords.
To learn more about using Google AdWords with Shopify, click here.
When you're setting up your AdWords campaign, make sure that your campaign budget reflects the amount that you're ready to spend. If you don't set up the parameters for your AdWords campaign properly, then you risk being charged more than you expect.
To read more about AdWords & Product Listing Ads, visit Google support.