When you install Order Printer Pro, it will check the number of orders your store received in the past 30 days and then choose the right plan for you based on that. Once the Subscription is accepted, you'll have a 14-day free trial.✨ After the 14-day free trial, the app assesses your monthly order volume. The app will continue to monitor your Shopify account for how many orders it gets each month, regardless of how many of those orders (or how many times) are printed or exported using the Order Printer Pro app.
If you were placed on the FREE plan because your store got less than 50 orders in a month, the app would not charge your account unless your store exceeds the 50 orders limit in a specific 30-day cycle. Only when your store goes over the 50 order threshold you will get a $10 charge for that cycle, this makes sure that you are only paying for the app in months when your store gets more than 50 orders. Once your store starts to get more than 50 orders consistently, you'll automatically be placed on the started plan, which costs $10.