Google Customer Reviews app will help you Show Survey Opt-in to your customers who place an order on your store.
That Survey Opt-in allows your customers to provide high quality feedback when it is requested by Google.
Google Sends Survey requests after few days of expected delivery dates.
Google Customer Reviews Program is available to merchants of following Countries
Have a look at those stores which are still getting reviews after program has been changed from Google Trusted Stores to Google customer reviews.