Laravel wih Paypal integration after success payment redirect issue

After successful payment I want to redirect users to payment success page but It is not redirecting as of now. Here's my code:

paypal integration using Srmklive\PayPal

Srmklive\PayPal\Providers\PayPalServiceProvider::class

paypal.php

<?php
return [
    'mode'    => env('PAYPAL_MODE', 'sandbox')
    'sandbox' => [
        'username'    => env('PAYPAL_SANDBOX_API_USERNAME', ''),
        'password'    => env('PAYPAL_SANDBOX_API_PASSWORD', ''),
        'secret'      => env('PAYPAL_SANDBOX_API_SECRET', ''),
        'certificate' => env('PAYPAL_SANDBOX_API_CERTIFICATE', ''),
        'app_id'      => 'APP-80W284485P519543T',
    ],
    'payment_action' => 'Sale',
    'currency'       => env('PAYPAL_CURRENCY', 'USD'),
    'billing_type'   => 'MerchantInitiatedBilling',
    'notify_url'     => '',
    'locale'         => '',
    'validate_ssl'   => false,
];

in payment method

$data = [];
        $data['items'] = [
            [
                'name' => 'name ',
                'price' => 100,
                'desc'  => 'Description for ItSolutionStuff.com',
                'qty' => 1
            ]
        ];
        $data['invoice_id'] = 1;
        $data['invoice_description'] = "Order #{$data['invoice_id']} Invoice";
        $data['return_url'] = route('payment.success');

        $data['cancel_url'] = route('payment.cancel');
        $data['total'] = 100;
$provider = new ExpressCheckout;

        $response = $provider->setExpressCheckout($data);
        $response = $provider->setExpressCheckout($data, true);

        return redirect($response['paypal_link']);

it is not responding to return_url or cancel_url

What am I missing here? Please Help!

via Chebli Mohamed