https://www.reuters.com/article/us-adyen-ipo/dutch-fintech-adyen-valued-at-up-to-8-3-billion-as-investors-seek-shares-idUSKCN1J119B >The listing of Adyen, the Dutch firm whose payments processing technology is used by Facebook and Netflix, got off to a strong start on Tuesday when investor demand for its shares covered those on offer within an hour.