Could it be the one where one is given a "gift" card" in order to test for "Loyalty" points? The description I read refers to perhaps 80 test scenarios at a designated site.
Receipts and photos must be taken and it is suggested that the shopper may be at the site at least 7 hours.
Yes, please report back.
It sounds to me like the shopper shall become an acute pita to the station's employees.