مشكلة عدم إتمام عملية الدفع عبر الـ API الخاص بـ Paypal

المُشكلة غير مُتعلقة بالكود على الأغلب، فالاتصال يتم وعند عملية الدفع عبر منصة بايبال تظهر المشكلة وهذا هو الكود المستخدم:

<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cookie;
use App\Http\Requests;
use App\Tables\Price;
use App\Tables\Tour;
use App\Tables\Order;
use App\Tables\Category;
use App\Tables\Cart;

use PayPal\Api\Amount;
use PayPal\Api\Details;
use PayPal\Api\Item;
use PayPal\Api\ItemList;
use PayPal\Api\Payer;
use PayPal\Api\Payment;
use PayPal\Api\PaymentExecution;
use PayPal\Api\ExecutePayment;
use PayPal\Api\RedirectUrls;
use PayPal\Api\Transaction;

class CheckoutController extends Controller
{
    private $apiContext;
    private $paypal_ClientId;
    private $paypal_ClientSecret;
    public function __construct()
    {
        $this->middleware('login');
        $this->paypal_ClientId = config('paypal_payment.Account.ClientId');
        $this->paypal_ClientSecret = config('paypal_payment.Account.ClientSecret');
        $this->apiContext = new \PayPal\Rest\ApiContext(
            new \PayPal\Auth\OAuthTokenCredential(
                $this->paypal_ClientId,
                $this->paypal_ClientSecret
            )
        );
    }

    public function index(Request $request)
    {
        $data['title'] = 'Checkout';
        $amount = 0;
        foreach(Cart::where('user_id', auth()->user()->id)->get() as $row){
            if(strtotime($row->order->date) < strtotime(date('Y-m-d 00:00:00', time()))){
                $row->delete();
            }
            if(!isset($row->order->price)){
                $row->delete();
            }
            $tour_date = '2000'.substr($row->order->date, 4);
            if(!(strtotime($tour_date) >= strtotime($row->order->price->availability->from_date) 
                && strtotime($tour_date) <= strtotime($row->order->price->availability->to_date))){
                $row->delete();
            }
            $total_amount = ceil($row->order->adult/$row->order->price->room_range)*$row->order->price->room_range*$row->order->price->adult;
            $total_amount += $row->order->child*$row->order->price->child;
            $total_amount += $row->order->infant*$row->order->price->infant;
            $total_amount += $row->order->extra_fee;
            Order::where('id', $row->order_id)->update(['total_amount' => $total_amount]);
            $amount += $total_amount;
        }
        $data['total_amount'] = $amount;
        return view('checkout', $data);
    }

    public function create()
    {
        //
    }

    public function store(Request $request)
    {
        $items = [];
        $checkout_amount = 0;
        foreach(Cart::where('user_id', auth()->user()->id)->get() as $row){
            if(strtotime($row->order->date) < strtotime(date('Y-m-d 00:00:00', time()))){
                $row->delete();
                continue;
            }
            if(!isset($row->order->price)){
                $row->delete();
                continue;
            }
            $tour_date = '2000'.substr($row->order->date, 4);
            if(!(strtotime($tour_date) >= strtotime($row->order->price->availability->from_date) 
                && strtotime($tour_date) <= strtotime($row->order->price->availability->to_date))){
                $row->delete();
                continue;
            }
            $total_amount = ceil($row->order->adult/$row->order->price->room_range)*$row->order->price->room_range*$row->order->price->adult;
            $total_amount += $row->order->child*$row->order->price->child;
            $total_amount += $row->order->infant*$row->order->price->infant;
            $total_amount += $row->order->extra_fee;
            Order::where('id', $row->order_id)->update(['total_amount' => $total_amount]);
            $checkout_amount += $total_amount;
            $tempItem = new Item();
            $tempItem->setName($row->order->tour->name)
            ->setCurrency('USD')
            ->setQuantity(1)
            ->setSku($row->order->id)
            ->setPrice($total_amount);
            $items[] = $tempItem;
        }
        $payer = new Payer();
        $payer->setPaymentMethod("paypal");
        $itemList = new ItemList();
        $itemList->setItems($items);
        $details = new Details();
        $details->setShipping(0)
            ->setTax(0)
            ->setSubtotal($checkout_amount);
        $amount = new Amount();
        $amount->setCurrency("USD")
            ->setTotal($checkout_amount)
            ->setDetails($details);
        $transaction = new Transaction();
        $transaction->setAmount($amount)
            ->setItemList($itemList)
            ->setDescription("Payment description")
            ->setInvoiceNumber(uniqid());
        $baseUrl = url('/').'/'.$request->segment(1).'/checkout';
        $redirectUrls = new RedirectUrls();
        $redirectUrls->setReturnUrl("$baseUrl/success")
            ->setCancelUrl("$baseUrl/failed");
        $payment = new Payment();
        $payment->setIntent("order")
            ->setPayer($payer)
            ->setRedirectUrls($redirectUrls)
            ->setTransactions(array($transaction));
        try {
            $payment->create($this->apiContext);
        } catch (Exception $ex) {
            return "Created Payment Using PayPal. Please visit the URL to Approve.";
        }
        $approvalUrl = $payment->getApprovalLink();
        return redirect($payment->getApprovalLink());
    }

    public function success(Request $request)
    {
        return $request->PayerID;
        $payment = Payment::get($request->paymentId, $this->apiContext);
        $execution = new PaymentExecution();
        $execution->setPayerId($request->PayerID);
        $transaction = new Transaction();
        $amount = new Amount();
        $details = new Details();
    }

    public function failed(Request $request)
    {
        //
    }

    public function show($id)
    {
        //
    }

    public function edit($id)
    {
        //
    }

    public function update(Request $request, $id)
    {
        //
    }

    public function destroy($id)
    {
        //
    }
}

وهذا تصوير للمشكلة من الموقع الذي أعمل عليه