Loyalty Cards into Wallet

Debit and credit cards can be added to Apple Wallet through the app, but other things must be added from the app you use them in. You may often be prompted to add a Starbucks rewards card to Wallet in the Starbucks app, a concert ticket in TicketMaster, or a boarding pass in the Delta app. Here is a list of apps that support Apple Wallet: https://apps.apple.com/us/story/id1270334375

Here are instructions on how to add passes from apps to Apple Wallet: Add, use, and share boarding passes, tickets, and other passes in Apple Wallet - Apple Support

There's an app in the App Store, called Key Ring, which is a great way to add your loyalty cards in one convenient location.