Examining rumor Walmart tracks customers even when they pay in cash

Walmart gave Snopes a possible explanation for a customer being sent an email about a product he purchased with cash.

Does Walmart track customers even when they pay in cash? What we know

Walmart gave Snopes a possible explanation for a customer being sent an email about a product he purchased with cash.
WGAL

Letters and checks from FTC regarding Legion Media, Amazon settlements are authentic

HERE’S ONE OF THE LETTERS PEOPLE ARE ASKING ABOUT, HEADLINED FTC VERSUS LEGION MEDIA. DOWN THE BOTTOM OF THE LETTER, AND ...