ISRC, ISWC, IPI, UPC: the four codes that decide whether you get paid
Four codes identify your recording, your song, you as a writer and your release. Royalties go missing when they don't line up with each other, usually because the splits disagree or nobody linked the recording to the song. Here is what each code does, who issues it, and a release-day checklist.
Industryvia International ISRC Agency (IFPI)