setDomainId example

if (empty($customerPayload) || !empty($customerPayload['permissions']) || !($customerPayload['expired'] ?? false) && $customerPayload['token'] === $currentContext->getToken()) {
            return $this->replaceContextToken($customerId, $currentContext);
        }

        $customerContext = $this->factory->create($customerPayload['token'], $currentContext->getSalesChannel()->getId(), $customerPayload);
        if ($customerPayload['expired'] ?? false) {
            $customerContext = $this->replaceContextToken($customerId, $customerContext);
        }

        if (!$customerContext->getDomainId()) {
            $customerContext->setDomainId($currentContext->getDomainId());
        }

        return $this->enrichCustomerContext($customerContext, $currentContext, $currentContext->getToken(), $customerId);
    }

    private function mergeCart(Cart $customerCart, Cart $guestCart, SalesChannelContext $customerContext): Cart
    {
        $mergeableLineItems = $guestCart->getLineItems()->filter(fn (LineItem $item) => ($item->getQuantity() > 0 && $item->isStackable()) || !$customerCart->has($item->getId()));

        $this->eventDispatcher->dispatch(new BeforeCartMergeEvent(
            $customerCart,