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):
            print term.name

            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