[GNC] Setting billterm with python bindings

[Giuseppe Foti]

Good morning,
I need some help using python bindings.
I have written a small script based on simple_invoice_insert.py to invoice
all my active customers.
My need is to set a bill term for each invoice, and I cannot understand how
to manage this.
I opened a bug reporting a sample code here
https://bugs.gnucash.org/show_bug.cgi?id=798126
It seems I can get billterms, but I cannot get their name or description.
Moreover, I don't know how to set a billterm to an invoice.
Any help would be really appreciated.