Aria Systems is an on-demand billing and subscription management company that has raised $20 million in funding led by InterWest Partners, Hummer Winblad, and Venrock. Now Aria has raised a total of $34 million. Aria’s platform can handle the entire online transaction process from the beginning to the end. Aria can automate recurring revenue models to manage the lifecycle of subscribers. Aria clients include Disney, DreamWorks, and Roku. Aria plans to use the new funding for international expansion, product development, and building their sales/marketing teams.