1. Go to this page and download the library: Download sudiptpa/paypal-rest library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
sudiptpa / paypal-rest example snippets
use Omnipay\Omnipay;
$gateway = Omnipay::create('PayPalRest_Rest');
$gateway->setClientId('xxxxxxxxxxx');
$gateway->setSecret('xxxxxxxxxxx');
$gateway->setTestMode('xxxxxxxxxxx');
$accessToken = $gateway->getToken();
or
$accessToken = $gateway->createToken()->send();