Klarna was once a small Stockholm-based outfit looking to offer payment services for online shops. Today, is tackling physical stores and looking to storm the U.S. It has plenty of support, including that of early investor Sequoia Capital. In fact, it has amassed more funding and a higher valuation than almost any other privately held company in the world. Can it live up to expectations? We’ll talk with cofounder and CEO Sebastian Siemiatkowski about the company’s ride so far, and where it goes next in this must-see sit-down.

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