But by using Magnetic Secure Transmission (MST), a tiny piece of hardware that sends the same signal as the magnetic strip on a credit card, Samsung is stressing that this card will work virtually anywhere. This technology also allows the S6, S6 Edge, S6 Edge+, and Note 5 to store loyalty cards and gift cards as well. Samsung acquired LoopPay, who originally developed the wireless transmission system, in February. LoopPay bills itself as "the most accepted mobile wallet on the planet," and Samsung believes that will give it the edge when it comes to making mobile payment viable and popular. Samsung Pay also works with NFC, and will work with American Express, Discover, MasterCard, and Visa.