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I have been asked to implement an iTunes Affiliate Free Music Downloads webpage. Of course, the iTunes Affiliate guy says there is no documentation or examples of how one would go about making this work. Would like to avoid reinventing the wheel.

Our corporate site is running Drupal 6. Every free download of a given song will have a unique code. iTunes Affiliate will give us a list of codes, it's our job to make the "free download" button grab a new code each time it is clicked-on.

Does anyone have advice or suggestions about how to proceed?