A module to calculate how much money each editor has earned

Hello there,
I am quite new to drupal but I was very impressed with some of the newspaper sites using Drupal, and have decided to use Drupal for developing my newspaper website.
However , there is one functionality that I need, which is calculate the fee for each publisher when an article is published, so that the manager of the website can see how much money they owe to each publisher.
I have gone through the forum but haven't found a module that do the job.
Do you guys know any thing like that, or do I need to write a module on my own?, please help me on this. thanks