ESPOO, Finland — After making its "Angry Birds" the dominant game on two mobile platforms, developer Rovio Mobile Ltd. is taking flight in a new line: payments.

The in-game payments system lets players of "Angry Birds" buy more mobile applications from the company, which bills the purchases to the user's monthly phone bill, according to American Banker, an affiliate of Credit Union Journal. This model has been gaining traction in recent months with U.S. wireless operators.

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