You only need to input your credit card information when you decide to upgrade to a premium plan.
Keep in mind that it is a subscription model, and the payment will be renewed automatically in the billing cycle you decide: monthly or yearly.
To guarantee you always have access to your premium account, make sure your card information is up to date.
Go to your account page to
- Edit you card information
- Add a new card
- Select your primary card, when you have multiple registered
- Delete a old card