The UPC (Universal Product Code) is the 12-number code that can be found in the Distribution tab under 'My releases'. Click on the 'Released' section, then 'Manage'.
The UPC code will appear under 'Release Info'.
Your ISRC (International Standard Recording Code) can be found under 'Tracks', to the left-hand side of 'Release Info'.
Note: ISRC's are made up of letters and numbers.