setSalesChannelShippingMethods example

$criteria = new Criteria();
            $criteria->setTitle('generic-page::shipping-methods');

            $event = new ShippingMethodRouteRequestEvent($request, new Request(), $context, $criteria);
            $this->eventDispatcher->dispatch($event);

            $shippingMethods = $this->shippingMethodRoute
                ->load($event->getStoreApiRequest(), $context, $event->getCriteria())
                ->getShippingMethods();

            $page->setSalesChannelShippingMethods($shippingMethods);

            $criteria = new Criteria();
            $criteria->setTitle('generic-page::payment-methods');

            $event = new PaymentMethodRouteRequestEvent($request, new Request(), $context, $criteria);
            $this->eventDispatcher->dispatch($event);

            $paymentMethods = $this->paymentMethodRoute
                ->load($event->getStoreApiRequest(), $context, $event->getCriteria())
                ->getPaymentMethods();