I don’t add google pay

Google Pay is available to download as an app from the App Store, but it doesn’t work the same way it would on an Android device. On iPhone, the Apple Wallet is the only wallet that will use NFC and allow that type of mobile payment. The Google Pay app on iPhone lets you send money to others, but it won’t let you do the “contactless” payments that it would on Android.

The following from Google Support may help: https://support.google.com/googlepay/?hl=en#topic=11450859