Google Seller Rating vs. Rich Snippets
Google Seller Rating is not the same as the rich snippets in Google. Whereas the rich snippets in Google shows the stars within the organic (unpaid) search results, Google Seller Rating shows the stars within the paid search results (ads & Google Shopping).
Example Google Seller Rating

Example rich snippets from Google

Although both stars look virtually the same, how they work is completely different. The rich snippets work via a code that you place on your own web store. WebwinkelKeur offers a ready-made option for this at no extra cost. The Google Seller Rating is obtained through a link with Google, the Google Seller Rating option can be activated through our dashboard. Thus, we offer both the rich snippets in Google and the Google Seller Rating. Also, watch this video to see the differences between the two stars.