public function canPay($member = null)
    {
        $extended = $this->extendedCan(__FUNCTION__, $member);
        if ($extended !== null) {
            return $extended;
        }

        if (!in_array($this->Status, self::config()->payable_status)) {
            return false;
        }
        if ($this->TotalOutstanding(true) > 0 && empty($this->Paid)) {
            return true;
        }
        return false;
    }