To add a card to your Plivo account, visit your dashboard and click on "Add a card."
Please make sure to enter the exact card details as per your bank records.
In order to use Plivo’s full suite of services, upgrade from a free trial to a Standard account. You can do so by completing the minimum recharge of $25.
You can set up auto-recharge in your account to avoid having to manually recharge or constantly monitor to your account credits. You can also set-up a threshold amount from the dropdown menu: