To verify your credit card,
Go to the Payments section of your Plivo account user interface.
Click on Verify Card next to the credit card you would like to verify
Once you click on Verify Card, Plivo will charge a small randomized amount between $1.00 and $2.00 to your credit card. You should see this transaction in your credit card immediately through the issuer’s online portal or on your next credit card statement. This verification charge is immediately refunded once you verify your card. Note that it may take up to 30 days from the date of refund for your card issuer to credit the amount back to your credit card.
Check your credit card statement or online credit card portal for a transaction with a description containing the words PLIVO, VERIFY, and a random 3 digit code.
Enter the transaction amount (in USD) or the 3 digit code from the transaction description in the card verification form that appears when you click on Verify Card.
Your card is now ready to be used.