Thanks to the ever-increasing market share of smartphones, people are doing a lot of things while on the move that used to require a separate computer, keyboard, and monitor. At SXSW, a PayPal exec explained how he’s seen these trends take shape.

Francesco Rovetta, director of business development for PayPal Mobile, told Abby Johnson that a lot of PayPal users have gone mobile. Indeed, the number of mobile transactions that went through PayPal increased fivefold last year, which Rovetta regards as a “very encouraging sign.”

Mobile eBay transactions have come to involve everything from computers to Lamborghinis, too, which is pretty remarkable.

PayPal’s of course doing its part to encourage mobile uptake. Not too long ago, the organization put out an iPhone app that lets users transfer money by “bumping” their phones, and this app has already been downloaded over 685,000 times.

What’s more, PayPal’s reached out to ordinary developers, making APIs available and trying to help them monetize their efforts.

Mobile definitely looks ready to play an important part in the future of business and sales online.