# Invoice numbering logic in Stripe Billing

Stripe Billing has a flexible numbering system which can be adjusted to comply with your country’s rules. Each invoice for a specific customer is given a random prefix, followed by a sequential number.
### **Example**
* Customer A: 68BB114-001, 68BB114-002, 68BB114-003
* Customer B: H22SF82-001, H22SF82-002, H22SF82-003
## Additional Information
* You can optionally customize the customer prefix. For example, if you have a customer named “Dynamic Industries”, you could set the prefix to “DYNAMIC” so their invoice numbers would be DYNAMIC-001, DYNAMIC-002, DYNAMIC-003.
* Any invoice created, regardless of its eventual invoice status (Paid, Past Due, Void), will be given a sequential number with its prefix.