Adyen BV, a Dutch financial technology company backed by Silicon Valley billionaires, is poised to pick JPMorgan Chase & Co. and Morgan Stanley to advise on a potential initial public offering, according to people familiar with the matter. A stock sale, raising up to 1 billion euros ($1.23 billion), may be held as early as this year, the people said, asking not to be named as details aren’t public. The payments firm could be valued in a range of 5 billion euros to 10 billion euros, one of the people said.