Open the Google Pay app
Tap your profile picture or initials in the top right
Tap your Google Account
Select Personal info
Tap Email
Update your email address if the option is available
If you want to use a different Google account, add the new account to your device and switch to it in Google Pay
If your GPay account is linked to your Google account email, change the email in your Google Account settings
If the email cannot be changed, create a new Google account with the desired email and use it in Google Pay
Reopen Google Pay and verify the updated email in your profile settings