I joined a company with exactly this pitch in 2012. In 2016, I acquired a company with this pitch as part of a major international Telco. I have built a prototype of this technology and run a pilot with a major international conference venue.

The stores aren't interested in your aggregated data, and they wouldn't know how to use it even if they were. They're interested in insights which you can't have, because you don't know their business. You're not delivering enough value to make a business. Sorry.