How to change my number on Apple wallet for verification code

Hello Fz786,

Thank you for using Apple Support Communities. If you want to update your Apple Pay contact information, we can point you in the right direction. Follow the steps listed here to update your phone number: Change or remove the payment cards that you use with Apple Pay - Apple Support

How to update your Apple Pay contact information

-iPhone: Go to Settings > Wallet & Apple Pay > scroll down to Transaction Defaults and update your shipping address, email, and phone number.

-Apple Watch: In the Apple Watch app on your iPhone, tap Wallet & Apple Pay > scroll down to Transaction Defaults and update your shipping address, email, and phone number.

-iPad: Go to Settings > Wallet & Apple Pay > scroll down to Transaction Defaults and update your shipping address, email, and phone number.

-Mac with Touch ID: In System Settings (or System Preferences), go to Wallet & Apple Pay > Click Contact and Shipping, and update your shipping address, email, and phone number. 

You had also mentioned verification codes. If your main issue is with two-factor authentication and you need to update your trusted phone number, follow the steps listed here: Two-factor authentication for Apple ID - Apple Support

On iPhone:

On your iPhone, iPad, or iPod touch: Go to Settings > your name > Password & Security. Next to Trusted Phone Number, tap Edit.

We hope this information is helpful. Cheers.