Wallet and Apple Pay not showing in System Settings. . .
On a new Mac, Wallet and Apple Pay were not appearing in System Settings. Many threads on this topic gave no help. For some reason, some help topics directed me to the Touch ID and Password section. I had a much that Touch ID on my keyboard was interfering with Wallet, and sure enough, once I disabled "use Touch ID" for Apple Pay and "use Touch ID" for iTunes Store etc. and restarted, Wallet and Apple Pay were then available in my System Settings. Once I re-added my cards, I then turned back on the two related Touch ID settings, and Wallet and Apple Pay are still available. Some rigamarole, but at least it's handled.
Mac Studio