You can enable our system to auto charge your credit card for further renewals of your subscription
during the payment process for a subscription, our system asks you whether you want to store the credit card details. Enable that option.
Then go in your control panel to My Account > Account > Account settings > Payment options and enable auto charge.
Please note that you can also enable automatic payments if you use as payment method PayPal. You will need to activate an subscription payment towards Servage via your PayPal account and renewal payments will be handled automatically by PayPal.