“The fintech firm is riding on a boom in cross-border commerce by Chinese sellers operating on foreign platforms. Founded in 2015, PingPong collects payments for Chinese exporters selling through services such as Amazon.com Inc., Shopify Inc. and Shopee, a unit of Singapore’s Sea Ltd., its website shows. PingPong is used by more than a million merchants for cross-border, value-added tax and supplier payments, according to the website.”