View Post Agencies | Brands | Campaigns | People | TV Gwen Stefani Stars in McCann XBC’s ‘Priceless Surprises’ for MasterCard By Erik Oster on Dec. 9, 2014 - 11:28 AM McCann XBC teamed up with Gwen Stefani in a new 30-second broadcast spot for MasterCard directed by Wondros’ Sophie Muller. The spot focuses on MasterCard’s integration with Apple Pay and the “priceless surprisesR ...