This is THE WordPress plugin to integrate Google Merchant Center’s “Google Customer Reviews” into your WooCommerce store.
It allows the Survey Opt-in code onto your Thank You (Order Received) page with the option to pick which location the popup will appear.
It also integrates the Google Customer Reviews Badge onto your site. You can choose to show it in the bottom left or bottom right. You can also choose to only show the badge when users are in the WooCommerce area of your website.
Full Info here - https://en-gb.wordpress.org/plugins/ecr-google-customer-reviews/