With Prepaid Plans, you make an upfront payment for a set period of service. Unlike subscription plans, these plans do not renew automatically. Once your prepaid period ends, you will need to manually purchase a new plan to continue the service.
When you recharge your account, for example, with the "30 CREDITS PLAN" your account will be active for 30 more days. Depending on the plan, the amount of active days will be added to your account in order for you to use the service. If you already have any CREDITS in your account, new CREDITS will be added to the existing ones.