Paypal, how to transfer multiple items?

Question

PayPal

I can't make a payment for several products, I can't find an error.

public function payWithpaypal(Request $request)
    {
        $payer = new Payer();
        $payer->setPaymentMethod('paypal');
        $cart = Cart::where('status', 1)->where('token', session()->getId())->get();
        $full_price = 0;
        $items = [];
        for ($i = 0; $i < count($cart); $i++){
            $items[$i] = new Item();
            $items[$i]->setName(($cart[$i]->product->title)) /** item name **/
                ->setCurrency('USD')
                ->setQuantity($cart[$i]->quantity)
                ->setPrice($cart[$i]->product->price); /** unit price **/

            $full_price += $cart[$i]->quantity * $cart[$i]->product->price;
        }

        $itemList = new ItemList();
        $itemList->setItems(array($items));

        $amount = new Amount();
        $amount->setCurrency('USD')->setTotal($full_price);

        $transaction = new Transaction();
        $transaction->setAmount($amount)
            ->setItemList($itemList)
            ->setDescription('Your transaction description')
            ->setInvoiceNumber(uniqid());

        $redirect_urls = new RedirectUrls();
        $redirect_urls->setReturnUrl(URL::to('status')) /** Specify return URL **/
        ->setCancelUrl(URL::to('status'));

        $payment = new Payment();
        $payment->setIntent('Sale')
            ->setPayer($payer)
            ->setRedirectUrls($redirect_urls)
            ->setTransactions(array($transaction));
        /** dd($payment->create($this->_api_context));exit; **/
        try {
            $payment->create($this->_api_context);
        } catch (PayPalConnectionException $exception) {
            dd($exception);
            if (\Config::get('app.debug')) {
                \session()->put('error', 'Connection timeout');
                return Redirect::to('/shop-cart');
            } else {
                \session()->put('error', 'Some error occur, sorry for inconvenient');
                return Redirect::to('/');
            }
        }

        foreach ($payment->getLinks() as $link) {
            if ($link->getRel() == 'approval_url') {
                $redirect_url = $link->getHref();
                break;
            }
        }

        /** add payment ID to session **/
        session()->put('paypal_payment_id', $payment->getId());

        if (isset($redirect_url)) {
            /** redirect to paypal **/
            return Redirect::away($redirect_url);
        }

        session()->put('error', 'Unknown error occurred');
        return Redirect::to('/');
    }

    public function getPaymentStatus()
    {
        /** Get the payment ID before session clear **/
        $payment_id = session()->get('paypal_payment_id');

        /** clear the session payment ID **/
        session()->forget('paypal_payment_id');
        if (empty(\request('PayerID')) || empty(\request('token'))) {
            \session()->put('error', 'Payment failed');
            return Redirect::to('/');
        }

        $payment = Payment::get($payment_id, $this->_api_context);
        $execution = new PaymentExecution();
        $execution->setPayerId(\request('PayerID'));

        /**Execute the payment **/
        $result = $payment->execute($execution, $this->_api_context);

        if ($result->getState() == 'approved') {
            \session()->put('success', 'Payment success');
            return Redirect::to('/');
        }

        \session()->put('error', 'Payment failed');
        return Redirect::to('/');
    }

dd $exception throws this error: Incoming JSON request does not map to API request.