https://www.reuters.com/article/us-usa-holidayshopping-macy-s/macys-says-processing-of-some-credit-cards-slow-on-black-friday-idUSKBN1DO2GH >Department store operator Macy's Inc said that processing of payments with some credit and gift cards was taking longer than usual in its stores on Black Friday, the traditional start of the key holiday shopping season.