To configure the invoice number template, go to the Settings > General > Invoices page.
Here you will find the “Invoice numbering template” field. You can specify both characters and various variables for it:
{C} - invoice counter;
{D} - current day;
{M} - current month;
{Y} - current year.
The {C} variable can be customized.
For example, {C:3} is a three-digit counting counter padded with a "0" on the left.
Combine variables to create intuitive templates!
You can customize not only the invoice number template, but also the invoice numbering. To do this, click on an example of an invoice number and edit the counter in the window that opens.