The "Plugin\決済方法のクラスパス" service or alias has been removed or inlined when the container was compiled.
 You should either make it public, or stop using the container directly and use dependency injection instead.

Container->get('Plugin\決済方法のクラスパス')
in Eccube/Controller/ShoppingController.php (line 715)

 *
 * @return PaymentMethodInterface
 */
private function createPaymentMethod(Order $Order, FormInterface $form)
{
    $PaymentMethod = $this->container->get($Order->getPayment()->getMethodClass());
    $PaymentMethod->setOrder($Order);
    $PaymentMethod->setFormType($form);
    return $PaymentMethod;
}