Stripe, I believe. Edit: Here's an article when they hit a $1.75B valuation: http://techcrunch.com/2014/01/22/with-an-eye-to-international-growth-payments-comp

Stripe, I believe. Edit: Here's an article when they hit a $1.75B valuation: http://techcrunch.com/2014/01/22/with-an-eye-to-international-growth-payments-company-stripe-raises-80m-from-peter-thiel-khosla-and-sequoia-at-a-1-25b-valuation/ http://techcrunch.com/2014/01/22/with-an-eye-to-internationa...