The OpenCart extension you are looking for allows you to set a custom invoice number for each order from the admin view order interface. This extension provides you with the flexibility to assign unique invoice numbers for your orders, rather than relying on the default sequential numbering system used by OpenCart.
With this extension, you can easily set the invoice number for each order by navigating to the order details page in the OpenCart admin dashboard. From there, you can enter the custom invoice number in a designated field and save it.
This extension also offers additional features to make managing your invoices more convenient. For example, it may allow you to search for orders by custom invoice number, making it easier to find specific orders. It may also provide an option to automatically generate invoice numbers based on certain criteria, such as the order date or customer name.
Overall, this OpenCart extension is a valuable tool for businesses that require greater flexibility and control over their invoice numbering system. It simplifies the process of assigning custom invoice numbers and provides useful features to help streamline your order management process.