I have a music file (bought on amazon). With this service https://www.get-metadata.com I figured out, that there is a upc and isrc code somehow in the file. The data is in this tag "Id3V2 Priv.www.amazon.com" and inside a xml.
My problem is, that i can't figure out, how to get this information with the python mutagen library. I could print out some xml data but I couldn't figure out how this is supposed to be done with mutagen.