How do I add the Grit card to Google Pay?

1. Open the Google Pay app
2. At the top, tap the card button
3. Swipe right until you find the blank card icon
4. Tap Add a payment method Debit or credit card
5. To capture your card info, use the camera. You can also enter your card info manually
6. Review and accept the terms from your card’s issuer
7. If you’re asked to verify your payment method:
   1. Choose a verification option from the list
   2. Enter the verification code

Note: After you add a card, on your account from Google, you might find a small temporary authorization. This authorization checks that your card and account are valid. It isn’t charged to your balance and will go away soon. Within 48 hours, most temporary authorizations are removed from your account.

Source: https://support.google.com/googlepay/answer/10192052