如何解决支付处理复杂性？使用Payum/core可以轻松搞定！

composer require payum/core

use Payum\Core\PayumBuilder;
use Payum\Core\Payum;

$payum = (new PayumBuilder())
    ->addDefaultStorages()
    ->addGateway('paypal_ec', [
        'factory' => 'paypal_express_checkout',
        'username' => 'your_paypal_username',
        'password' => 'your_paypal_password',
        'signature' => 'your_paypal_signature',
        'sandbox' => true
    ])
    ->getPayum();

$storage = $payum->getStorage('Payum\Core\Model\ArrayObject');
$payment = $storage->create();
$payment->setNumber(uniqid());
$payment->setCurrencyCode('USD');
$payment->setTotalAmount(1000); // 10.00 USD
$payment->setDescription('A description of the payment');
$payment->setClientId('ANONYMOUS');
$payment->setClientEmail('foo@example.com');

$captureToken = $payum->getTokenFactory()->createCaptureToken('paypal_ec', $payment, 'done.php');

header("Location: ".$captureToken->getTargetUrl());