How can I keep track of my maximum number of invoices per month?

When you are close to reaching the maximum number of invoices of your bundle in your domain, a notification will appear in your domain.

This notification is also sent by email to all users with the 'Management' role in your domain.

An overview of all processed transactions per month can be found in the PO Box. Here you click on 'Processed transactions' on the left side of your screen.