buildUpsertProducts example

    #[Route(path: '/store-api/customer/wishlist/merge', name: 'store-api.customer.wishlist.merge', methods: ['POST'], defaults: ['_loginRequired' => true])]     public function merge(RequestDataBag $data, SalesChannelContext $context, CustomerEntity $customer): SuccessResponse
    {
        if (!$this->systemConfigService->get('core.cart.wishlistEnabled', $context->getSalesChannel()->getId())) {
            throw CustomerException::customerWishlistNotActivated();
        }

        $wishlistId = $this->getWishlistId($context, $customer->getId());

        $upsertData = $this->buildUpsertProducts($data, $wishlistId, $context);

        $this->wishlistRepository->upsert([[
            'id' => $wishlistId,
            'customerId' => $customer->getId(),
            'salesChannelId' => $context->getSalesChannel()->getId(),
            'products' => $upsertData,
        ]], $context->getContext());

        $this->eventDispatcher->dispatch(new WishlistMergedEvent($upsertData, $context));

        return new SuccessResponse();
    }