ProxyPanel/app/Http/Controllers/PaymentController.php

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Rest\ApiContext;
use Response;
use Redirect;
use Captcha;
use Cache;
use PayPal\Api;
use Paypal\Rest;
use Paypal\Auth;

class PaymentController extends Controller
{
    function __construct()
    {
        //
    }

    public function create(Request $request)
    {
        $apiContext = new ApiContext(
            new OAuthTokenCredential(
                'AYSq3RDGsmBLJE-otTkBtM-jBRd1TCQwFf9RGfwddNXWz0uFU9ztymylOhRS',     // ClientID
                'EGnHDxD_qRPdaLdZz8iCr8N7_MzF-YHPTkjs6NKYQvQSBngp4PTTVWkPZRbL'      // ClientSecret
            )
        );

        $payer = new Api\Payer();
        $payer->setPaymentMethod('paypal');

        $amount = new \PayPal\Api\Amount();
        $amount->setTotal('1.00');
        $amount->setCurrency('USD');

        $transaction = new \PayPal\Api\Transaction();
        $transaction->setAmount($amount);

        $redirectUrls = new \PayPal\Api\RedirectUrls();
        $redirectUrls->setReturnUrl("https://example.com/your_redirect_url.html")
            ->setCancelUrl("https://example.com/your_cancel_url.html");

        $payment = new \PayPal\Api\Payment();
        $payment->setIntent('sale')
            ->setPayer($payer)
            ->setTransactions(array($transaction))
            ->setRedirectUrls($redirectUrls);
    }
}