PayPal Holdings ([[PYPL]] -1.8%) CEO Dan Schulman expects the use of digital currencies to go mainstream as more merchants embrace a "digital first" approach to payments, according to comments he made at the Web Summit conference today.Retailers are shifting to accept payments via smartphones and QR codes and more customers adopt the use of digital wallets, which are "natural complements to digital currencies," Schulman said.In October, the company unveiled a service where PayPal customers can buy, sell and hold cryptocurrencies including bitcoin, ether, and Litecoin from digital wallets. The company also plans to allow customers to use crypto to pay for purchases at its 26M merchants.Schulman sees his biggest rival as Ant Group, China's biggest mobile-payment company. Ant, which is one-third owned by Alibaba (BABA), has had "tremendous success inside China" with a digital wallet that includes "all elements of financial services, all elements of shopping," he said.SA contributor Star
