The amount stated in each plan refers to the maximum number of QR Codes that can remain active at any given time.This means you can always create more if you pause or delete other QR Codes.
The amount is attributed for the year. However, each year when your contract renews, you'll get the same number of QR Codes added on top of your initial allowance. This means you'll be able to manage more QR Codes for the same price since the subscription fee stays the same every year.