eiru_pos/models/account_payment_term.py

from openerp import api, fields, models

class AccountPaymentTerm(models.Model):
    _inherit = 'account.payment.term'

    @api.model
    def get_account_payment_terms(self):
        domain = [('active', '=', True)]
        terms = []

        for term in self.env['account.payment.term'].search(domain):
                lines = []

                for line in term.line_ids:
                    lines.append({
                        'id': line.id,
                        'display_name': line.display_name,
                        'days': line.days,
                        'value_amount': line.value_amount
                    })

                terms.append({
                    'id': term.id,
                    'name': term.name,
                    'display_name': term.display_name,
                    'lines': lines
                })

        return terms