$Order->setPayment($payments[0]);

// 配送業者の支払方法を取得
        $payments = $this->getFormPayments($deliveries, $Order);

        //配送方法の選択によっては支払い方法がないものが選択されている状態になるため、その場合支払い方法の1つ目を設定するように。
        $isFound = false;
        foreach ($payments as $payment) {
            if ($payment->getId() == $Order->getPayment()->getId()) {
                $isFound = true;
            }
        }
        if ($isFound == false) {
            $Order->setPayment($payments[0]);
            $Order->setPaymentMethod($payments[0]->getMethod());
            $Order->setCharge($payments[0]->getCharge());
            $Order = $this->getAmount($Order);
        }

public function getFormPayments($deliveries, Order $Order)
    {
        $productTypes = $this->orderService->getProductTypes($Order);

        if ($this->BaseInfo->getOptionMultipleShipping() == Constant::ENABLED && count($productTypes) > 1) {
            // 複数配送時の支払方法
            $payments = $this->app['eccube.repository.payment']->findAllowedPayments($deliveries);
        } else {
            // 配送業者をセット
            $shippings = $Order->getShippings();
            $payments = array();
            foreach ($shippings as $Shipping) {
                $paymentsShip = $this->app['eccube.repository.payment']->findPayments($Shipping->getDelivery(), true);
                if (!$payments) {
                    $payments = $paymentsShip;
                } else {
                    $payments = array_intersect($payments, $paymentsShip);
                }
            }
        }
        $payments = $this->getPayments($payments, $Order->getSubTotal());

        return $payments;
    }