code: def complete_invoice(self, invoice_id, complete_dict):
          
          return self._create_put_request(
              resource=INVOICES,
              billomat_id=invoice_id,
              command=COMPLETE,
              send_data=complete_dict
          )
docs: Completes an invoice
  
          :param complete_dict: the complete dict with the template id
          :param invoice_id: the invoice id
          :return: Response