The following is a checklist of steps you should take every time you run bills.
1. Validate and sync your servers with the billing server.
2. Check that all lists have been assigned to customers or to fake accounts.
3. If you have customers who have prepaid, set the Carry-Over Remaining Credits.
4. Run the bills, creating a bill for each customer.
6. Terminate any customer who should not receive future bills.
7. Terminate lists.
More
1. Billing
3. Adding, Validating and Syncing Servers
5. Creating Additional Charges
8. Assigning Hosting Plans, Charges and Lists
10. Running Bills
14. Billing Checklist
15. Billing Reports
17. Viewing a Customer's History