In case your credit card is expired or for some other reason you would like to update the card details, follow these steps
Login to Kendis with "Super Admin" rights so the left navigation settings icon is available to you.
Click on the "Settings" icon and select "Billing"
In the billing section click on the "Change Card" link
Once you updated the card details, you will be charged again on the "Next Billing Date" visible at the top right corner.