A method and apparatus for calculating fees charged to users based on the plug-in use is disclosed. An application framework is provided as an extensible software platform. Users may integrate plug-in components into the application framework. Each plug-in component may identify a fee model defining how charges are assessed for using the plug-in. An auditing component, calculates the fees charged to each user of the customized application framework based on the features of the application framework and the plug-in use made by each individual user.
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