Like its competitors, Swyp lets you load your plastic cards into a special digital card-sized device that can emulate the magnetic stripe on any credit, debit card or gift card. A retailer simply swipes the Swyp at a point-of-sale terminal just like a regular credit card. As with most of those universal cards, only one set of credentials is active at any given time, requiring you to select the appropriate card on your smartphone or on the device’s interface before any transaction