Pre-requisite: Download Google Wallet app from the Google Play store
Step 1: Open Google Wallet
Step 2: Select the "+" symbol to add a card
Step 3: Select "Payment card"
Step 4: Select "New credit or debit card"
Step 5: Manually enter the card details or scan it with your phone's camera
Step 6: Select "Accept" to consent to the terms and conditions
Step 7: Select either "Email" or "SMS" to receive the 6-digits one-time-pin (OTP)
Step 8: Enter the 6-digits OTP
Step 9: Google Pay will be activated at this step