is_cancelled = models.BooleanField(_('cancelled'), default=False)
payed_at = models.DateTimeField(_('payed at'), null=True, blank=True)
started_at = models.DateTimeField(_('started at'), auto_now_add=True)
is_cancelled = models.BooleanField(_('cancelled'), default=False)
payed_at = models.DateTimeField(_('payed at'), null=True, blank=True)
started_at = models.DateTimeField(_('started at'), auto_now_add=True)