https://medium.com/bloomberg/as-amazon-leads-cashless-charge-states-and-cities-push-back-36abd99b51f1 > BloombergBlockedUnblockFollowFollowingMar 27A customer uses a smartphone to make a payment on a Square device in San Francisco. Photo: David Paul Morris/BloombergBy Olga Kharif and Krista Gmelich > Rebecca Esparza works with homeless people and, having once lived in a shelter herself, knows what it’s like to navigate the U.S…