Many Mastercard credit cardholders in the U.S. are getting a fleet of new benefits, most of which start April 16, in partnership with major digital brands such as Lyft, Postmates, Fandango and more. New benefits will be added to cards at the “World” and “World Elite” levels. Plenty of cards run on the Mastercard payment network, but not... Melissa Lambarena is a writer at NerdWallet.