## Update BillConfig

You can use the **Update BillConfig** endpoint to set a global lock date for **all** Bills - any Bill with a service period end date on or before the set date will be locked and cannot be updated.

**Ensure all Bills are Approved!** If you try to set a global lock date when there remains Bills in a _Pending_ state whose service period end date is on or before the specified lock date, then you’ll receive an error.