The amount mentioned in each plan refers to the maximum number of QR Codes that can remain active at any given time. It means that you can always create more if you archive some of the QR Codes. Nevertheless, archived or deleted QR Codes are deactivated.
The amount is attributed for the year. However, every year that your contract is renewed, you will get the same number of QR Codes added on the top of your initial allowance. So you will be able to manage more QR Codes for the same price as the subscription fee stays the same every year.