Adyen (OTCMKTS: ADYEY ) is a potentially massive global technology company that provides payment solutions, including in-person, online, risk management, and financial products to digital businesses, mobility, subscription, and marketplaces. Better, all the payments processed through McDonald's (NYSE: MCD ), for example, go through Adyen. Its customer list includes other monster blue-chip companies like Microsoft (NASDAQ: MSFT ) and Booking Holdings (NASDAQ: BKNG ), among others.