Amazon.com, Inc. (NASDAQ:AMZN ) said that Pay with Amazon — which allows shoppers to make purchases on outside websites using their Amazon account details — has now been used by 33 million customers around the globe. Pay with Amazon total volume more than doubled in 2016, as the company rolled the service out to several new countries, including France, Italy, and Spain.

Written by Stocknews.com

AMZN noted that over half of Pay with Amazon users are Prime members, and 32% of the transactions were made using a mobile device.

Pay with Amazon is aimed at providing shoppers the convenience of a single Amazon login to make payments almost anywhere online. Amazon charges merchants a flat 2.9% processing fee for each transaction they process, plus a $0.30 authorization charge. For transactions made between countries, the processing fee rises to 3.9%.

The average Pay with Amazon purchase size was $80 in 2016, which equates to about $2.62 in processing fees per domestic order collected by Amazon.

The relatively new service encroaches on territory traditionally held by PayPal (PYPL), which was among the first online payment services to allow users to use their logins to purchase goods on other platforms (most notably eBay, which later acquired the company and subsequently spun it off).

The company commented via press release:

“As we have introduced new experiences with merchants, we have seen a significant increase in the number of customers using the information from their Amazon account to make purchases on merchant websites,” said Patrick Gauthier, vice president, Amazon Payments. “Amazon Payments brings the simplicity and familiarity of Amazon’s buying experience to our merchant customers, making it easy for millions of Amazon customers around the world to pay using the information already stored in their Amazon account.”

…Year-to-date, AMZN has gained 7.62%, versus a 2.62% rise in the benchmark S&P 500 index during the same period.