PayPal said on Tuesday it would expand its One Touch payments product to 13 new markets in Europe and Australia, bringing a simpler check-out to online shoppers and merchants. The company said "millions" of consumers had already enabled One Touch to make payments on desktops and through mobile apps in the United States, United Kingdom and Canada and that half of the world's top 100 online retailers were already using the program.

Existing PayPal users can opt-in to use One Touch once and then no longer be required to re-enter their billing and shipping information into shopping apps or websites that support PayPal in their checkouts. Merchants that already accept PayPal will see One Touch automatically enabled, PayPal said.

PayPal said more than half of e-commerce shopping sessions are taking place on mobile but said that only around 10 to 15 percent of purchases occur on mobile devices.