It's always a treat when I get outside of Yahoo Finance HQ in New York City and visit companies where they live and breathe. Like I love doing this stuff. This is just what I do and I'm in the zone.For this episode of Power Players, I am in Purchase New York, headquarters [music] for Mastercard. You know Mastercard. You've used their cards. You've seen them on TV. You've seen those priceless commercials.I'm going inside the future of Mastercard with CEO Michael Maybach. We're going to talk about everything ...