PayPal announced today that it’s paying $400 million in cash for Hyperwallet, an 18-year-old, Bay Area-based company that helps people and small businesses receive payments for products and services that they sell, including through the vacation rental platform HomeAway and Rodan & Fields, the multi-level marketing company that specializes in skin care products and employs an army of consultants to sell toners and the like.

Hyperwallet interlinks cash networks, card schemes and mobile money services with domestic ACH networks around the world to enable what it characterizes as “disruptively priced” and, as crucially, compliant mass payments.

It isn’t clear as of this writing how much money Hyperwallet had raised over the years, though the WSJ notes that Primus Capital, the private equity firm, is a major shareholder.

According to Crunchbase, the company has also received funding from the financial services company Raymond James.

Hyperwallet was founded by Lisa Shields, an MIT-trained engineer who originally launched the company in Vancouver, where she last year founded a second company called FI.SPAN, which is an API management platform that aims to allow banks to quickly deploy new business banking products. Shields seemingly keeps a low profile compared with many founders. When she was presented with an Entrepreneur of the Year award by EY in 2015, she said, “I am honored and humbled, not to mention surprised.” (Hyperwallet has been led since 2015 by CEO Brent Warrington, who previously served as CEO of a company called SecureNet Payment Systems that was acquired.)

As for why PayPal acquired it, it says it enhances its ability to provide payment solutions to e-commerce platforms and marketplaces around the world, noting in a release about the deal that marketplace sales accounted for more than 50 percent of global online retail sales last year.

The acquisition is just the latest in a long string of companies PayPal has acquired over the years. Just last month, it shelled out a whopping $2.2 billion to acquire the European payments company iZettle in an all-cash deal that’s believed to be PayPal’s biggest.