Google is already on top of that data: https://www.bloomberg.com/news/articles/2018-08-30/google-and-mastercard-cut-a-secret-ad-deal-to-track-retail-sales http

Google is already on top of that data: https://www.bloomberg.com/news/articles/2018-08-30/google-and-mastercard-cut-a-secret-ad-deal-to-track-retail-sales https://www.bloomberg.com/news/articles/2018-08-30/google-an...