This option controls the way invoices are generated. There are two available options:
Invoices will need to be generated manually using the generate invoice option for the particular order.
Invoices are generated as soon as the order is placed. The Invoice number is automatically generated using the invoice prefix and next invoice sequence number. For COD (pending) orders, the invoice will be generated automatically once the order gets paid. If Generate Invoice for Unpaid Orders setting is enabled, then, a Generate Invoice command is also visible
The invoice number prefix is the initials added to an automatic invoice sequence number maintained in the system to generate invoice number.
It shows the last generated invoice number. There is an internal sequence number maintained. The sequence number starts at 1 and keeps on incrementing automatically on every invoice generation. It can be changed by admin to start invoice number of his own choice.
For generating invoice of COD(pending) orders, this setting needs to be enabled.
In the case of automatic invoice generation, if you want the invoice to be sent to the customer automatically via email, then you need to enable this setting.
To generate the invoice for the particular order, go to Orders section and open the order whose invoice is to be generated, click on the ellipsis icon and select Generate invoice.
To generate the invoice number manually select Manually and enter the invoice number of your choice. Else you can also generate the invoice number manually where the system will automatically generate the next available invoice number.