You can add your viva.com card to Google Wallet (Google Pay) only through the viva.com App:
From the viva.com app on your Device, choose the card you want to add on Google Wallet and press the “Add to GPay” button
You will receive an OTP code on your registered mobile number, to approve this action
Follow the instructions on the screen and select "Add and continue"
Agree to the Terms and Conditions
Viva.com will confirm your details. Once your card is ready for use, you will receive a message indicating that the card has been added to the Wallet and is ready for Tap to Pay transactions
In the Google Wallet (Google Pay) app, you will see the card you just added among the available cards.
For more information about setting up Google Wallet (Google Pay) on your device, click here.