MP3 Affiliate Program

Hi, I am looking for an affiliate program, that allows the users of my website to buy mp3s via an external site (itunes, amazon, etc.). BUT: I need to be able to display the mp3 file that was bought within the profile of that user after the purchase where he/she can download the file. So a simple link is not enough, there needs to be some API that allows a certain exchange. Does anyone know a music platform with some similar program?
Thanks,
Robin

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