If you have fewer than 50 orders in the last 30 days, access to Escalafy is free. You don't need to do anything special to activate it.
When you start paying
Once you reach 50 orders in the last 30 days, you move to the plan that matches your volume. You can see which one in the Subscription section, in the left sidebar.
If your volume drops
The calculation always looks at the last 30 days from the day you're on, not the calendar month. If you drop back below 50 orders in a slow month, free access applies again.