How to force invoice generation?

Hello,

First, congratulations an thanks for developing such a nice piece of code, it works great!

I’ve been struggling because I need an invoice to be created (but not sent, just created) with every single completed order. I read your documentation about how the invoice numbers are created, and I tried enabling ‘New order (admin mail)’, ‘Complete order’ and ‘Customer receipt (manual mail)’ options, but it still not forces invoice creation and new number assignation. It means I have to go back to ‘Orders’ and click in the PDF icon (in order) to generate the invoices manually.

Is there any way of making this?

Thanks in advance!