At the 2016 Rio Olympics, Visa will be the only card accepted at official venues.  The company will be using the event to introduce a new method of contactless payment that will allow people to pay with a wave of their hand via a ring.  The initial trial will include Visa employees and partners as well as 45 athletes who are sponsored by the brand, including swimmer Missy Franklin and fencer Ibtihaj Muhammad.  More info here.