picture-6.pngBuxfer, a site that helps you and your friends keep track of shared expenses, announced today that it is using Amazon’s new payment service to allow its users to settle debts with each other from within the site.

Buxfer competes with a number of other startups focused on helping people do a better job of managing their personal finances, such as Billmonk.

Buxfer stands out for taking a strongly group-oriented approach, quickly showing you how much you owe and are owed from friends.

A built-in payment system has been a big missing component as tracking shared expenses is less useful if you have to separately handle the transcation.

Amazon’s service has been getting good reviews from even normally harsh critics due to its developer-friendly features for customizing to specific sites.

Buxfer’s payment service is free through the end of August. After then, people receiving money will incur a 1.5-2 percent fee, depending on how the payment is made. The service is only available in the United States. More coverage here.