Class not found in Laravel 7 - laravel

Question

I have installed a package for Laravel 7, the package in question is this http://paypal.github.io/PayPal-PHP-SDK/ to manage payments with Paypal.
I created everything, controller, web route, everything.
But the moment I go to the page to test I can't find the class.
Target class [App\Http\Controllers\PaypalController] does not exist.
PaypalController.php
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use PayPal\Rest\ApiContext;
use PayPal\Auth\OAuthTokenCredential;
// use to process billing agreements
use PayPal\Api\Agreement;
use PayPal\Api\Payer;
use PayPal\Api\Plan;
use PayPal\Api\ShippingAddress;
class PaypalController extends Controller
{
private $apiContext;
private $mode;
private $client_id;
private $secret;
private $plan_id;
// Create a new instance with our paypal credentials
public function __construct()
{
// Detect if we are running in live mode or sandbox
if(config('paypal.settings.mode') == 'live'){
$this->client_id = config('paypal.live_client_id');
$this->secret = config('paypal.live_secret');
$this->plan_id = env('PAYPAL_LIVE_PLAN_ID', '');
} else {
$this->client_id = config('paypal.sandbox_client_id');
$this->secret = config('paypal.sandbox_secret');
$this->plan_id = env('PAYPAL_SANDBOX_PLAN_ID', '');
}
// Set the Paypal API Context/Credentials
$this->apiContext = new ApiContext(new OAuthTokenCredential($this->client_id, $this->secret));
$this->apiContext->setConfig(config('paypal.settings'));
}
public function paypalRedirect(){
// Create new agreement
$agreement = new Agreement();
$agreement->setName('App Name Monthly Subscription Agreement')
->setDescription('Basic Subscription')
->setStartDate(\Carbon\Carbon::now()->addMinutes(5)->toIso8601String());
// Set plan id
$plan = new Plan();
$plan->setId($this->plan_id);
$agreement->setPlan($plan);
// Add payer type
$payer = new Payer();
$payer->setPaymentMethod('paypal');
$agreement->setPayer($payer);
try {
// Create agreement
$agreement = $agreement->create($this->apiContext);
// Extract approval URL to redirect user
$approvalUrl = $agreement->getApprovalLink();
return redirect($approvalUrl);
} catch (PayPal\Exception\PayPalConnectionException $ex) {
echo $ex->getCode();
echo $ex->getData();
die($ex);
} catch (Exception $ex) {
die($ex);
}
}
public function paypalReturn(Request $request){
$token = $request->token;
$agreement = new \PayPal\Api\Agreement();
try {
// Execute agreement
$result = $agreement->execute($token, $this->apiContext);
$user = Auth::user();
$user->role = 'subscriber';
$user->paypal = 1;
if(isset($result->id)){
$user->paypal_agreement_id = $result->id;
}
$user->save();
echo 'New Subscriber Created and Billed';
} catch (\PayPal\Exception\PayPalConnectionException $ex) {
echo 'You have either cancelled the request or your session has expired';
}
}
}
Routes
Route::get('/subscribe/paypal', 'PaypalController#paypalRedirect');
Route::get('/subscribe/paypal/return', 'PaypalController#paypalReturn');
I can't understand what the problem is! Thank you all

Answer 1

Just run:
composer dump-autoload
to regenerate all classes, see: https://getcomposer.org/doc/03-cli.md

Answer 2

Mention the Laravel 7 route:
Route::post('create_paypal_plan','App\Http\Controllers\PaypallController#create_plan');
just like this.