Expected functionality:

Each plan should have a defined booking quota per period (e.g., 10 / 50 / unlimited).

When a user attempts to create a new booking, the system should:

Check the current quota (either per calendar month or over a rolling 30-day window).

Block the booking if the quota has been reached.

Display a clear message:

“You have reached the booking limit of your plan. Please upgrade to a higher plan to continue accepting appointments.”

Key points:

The counter must reset automatically at the start of each period (e.g., on the 1st of every month).

The blocking must be strict: it should be impossible to add new bookings once the quota is reached.

Optional: ability to send alerts at 80% usage to warn the user in advance.

Example:

Starter: 10 bookings / month

Pro: 50 bookings / month

Business: Unlimited