A Universal Product Code (UPC) is the unique code that identifies your album as a digital product. Each release will have only one UPC, which will be generated by CmdShft free of charge if you don’t provide your own.
An ISRC (International Standard Recording Code) is used to identify an individual sound recording. Each track on your release will have a unique ISRC, which will be generated by CmdShft free of charge if you don’t provide your own.