You can update your payment information from your EWS Backoffice by following the next steps:
Login to your Backoffice on www.enagicwebsystem.com / Login tab on your right.
Click on Settings on the left menu.
Click on Billing / Account.
Click on Change My Payment Method.
Insert the new credit card information you want to use.
Click on Proceed.
The registered card will be automatically charged on your due date.