Alternative to Apple Wallet app for iPad

FYI: Apple Wallet for iPad is part of “Settings”

It’s not as “fully featured” as the iPhone app (as iPads don’t have NFC) but it can be used to make online purchases; to review transactions, and make payments.

Or you can search for "wallet" in the App Store and see what comes up that interests you. Most are for various forms of cryptocurrency, but there are others.

Regards.