CheckoutCartPageLoadedEvent example

        $page->setCountries($this->getCountries($salesChannelContext));

        $page->setPaymentMethods($this->getPaymentMethods($salesChannelContext));

        $page->setShippingMethods($this->getShippingMethods($salesChannelContext));

        $page->setCart($this->cartService->get($salesChannelContext->getToken(), $salesChannelContext));

        $this->eventDispatcher->dispatch(
            new CheckoutCartPageLoadedEvent($page, $salesChannelContext, $request)
        );

        return $page;
    }

    private function getPaymentMethods(SalesChannelContext $context): PaymentMethodCollection
    {
        $request = new Request();
        $request->query->set('onlyAvailable', '1');

        return $this->paymentMethodRoute->load($request, $context, new Criteria())->getPaymentMethods();
    }