Plimus, a nine year old payments company with a strong international base of sellers, is adding its name today to the growing list of companies that wants to manage user payments in online games.

The name of the company’s new product, Buy Anyware, reflects Plimus’s intention to build payments directly into Flash games. Many Facebook games already allow in-game transactions, of course, but Plimus is also targeting the casual and massively multiplayer markets.

A more important differentiator for Facebook developers may be Plimus’s long experience with international transactions. Online software sales has been the main business for Plimus to date, with a majority of sellers being based overseas, according to Simon Jones, the company’s vice president of strategic solutions

Other payment platforms focus on a smooth user-facing experience, Jones says, but to the detriment of their underlying process. “They don’t have the right reporting, they don’t have subscriptions set to run automatically, they don’t have orders set up to process by processors in the same region as the bank that issued the credit card,” Jones claims, listing a few problems he’s seen. “I can’t tell you how often I see payment types that look exciting on the front-end, but once I take a look, they can’t manage on the back-end.”

While Buy Anyware is only being announced today, Plimus claims to already work with a few gaming companies, including Youda Games, Playdom, Namco and Blizzard.