OK, stupid question, what is the thing this utility does that can't be achieved with scanning a physical pass with barcode or entering the details manually into a Google Wallet?
Because I don't see the.... utility if it?
Unless this achieves something specific I don't know.
I don’t know about Google Wallet, but for iOS Wallet, it is not possible to create a new entry there yourself as a normal user. It has to be signed with a $99/yr certificate, so this thing does the signing for you. The utility is that whatever you created now lives with the rest of the passes in one place.