Dynamic QR codes mentioned in the plan (i.e. 10, 50, 300, 900), can I create them on a monthly basis or on an annual basis?

Depending on your plan, the maximum number of dynamic QR Code creation limit is as mentioned on the pricing page. E.g., if you purchase a Pro plan, you may create up to 300 dynamic codes at any given time your plan is active. If you use a dynamic QR code for a limited period, say 15 days, you may delete it and replace it with a new code, and the count will remain the same.

If you have Pro Plan and create 300 dynamic codes, they will remain active as long as the plan is active, but if you move to a Free plan, then only 10 codes (free plan limit) will remain active other codes will pause.