A UPC/EAN is required per release. You are welcome to use your own UPC if you have one. Otherwise, Record Union can generate one for $10 – just check the box for "I don't have a code" when creating your release before the checkout page.

An ISRC is required for each track. You are welcome to use your own ISRCs if you have them already. Otherwise, Record Union can generate them for free by leaving the field for ISRC blank.