https://www.mastercard.us/en-us/consumers/offers-promotions/fareback-fridays-promotion.html -“Every Friday in June and July, tap your contactless credit or debit Mastercard at an NYC MTA contactless terminal at any station between Grand Central and Atlantic Avenue-Barclays Center on the 4, 5, or 6 subway lines to pay for a single-fare subway ride, and Mastercard will refund your fare. *Limit two rides per cardholder per Friday. “