Wallet Ap missing

There has never been a Wallet app for iPad. It exists on iPhone (and Apple Watch and iPod Touch).

Instead of telling us how you’re trying to do something, you should tell us what you’re trying to do and cannot do.

Thanna99 wrote:

I (and Siri) cannot open Apple wallet on IPad in order to edit the credit card data.

Try Settings > Wallet & Apple Pay > [the card] > …