Create invoice from external app

Is there a simple way to create an invoice and post the invoice from a external app? I have a python desktop that needs to track invoices but it would be way to much to rewrite the python using tryton code.

You can use Proteus for that. On the forum here there are some other topics about this as well. Like how to connect to Tryton etc. Just use the search function.

Thank you - that was very helpful. I was not aware of Proteus. I will review the module and try to determine what the steps are to create the invoice.