protected function validatePaymentOrder()
    {
        $field = 'payment';

        if ($this->isExcluded($field)) {
            return null;
        }

        $value = $this->getSubmitted($field);

        if ($this->isUpdating() && !isset($value)) {
            $this->unsetSubmitted($field);
            return null;
        }

        $label = $this->translation->text('Payment');

        if (empty($value)) {
            $this->setErrorRequired($field, $label);
            return false;
        }

        $method = $this->payment->get($value);

        if (empty($method['status'])) {
            $this->setErrorUnavailable($field, $label);
            return false;
        }

        return true;
    }