You are charged when you run a query. Invoices are automatically generated by your PDC account on the first of each month and include all queries performed the previous month. We do not mail invoices or statements. An email notification will be sent to the primary account holder once an invoice is available. A second notification will appear in your PDC account. You can access and pay your invoices thru your PDC account with a credit card or you can pay with a check within 30 days.