在PHP中将多个项目发送到paypal rest api的正确方法

require 'vendor/autoload.php';

use PayPal\Api\Amount;
use PayPal\Api\Details;
use PayPal\Api\Item;
use PayPal\Api\ItemList;
use PayPal\Api\Payer;
use PayPal\Api\Payment;
use PayPal\Api\PaymentExecution;
use PayPal\Api\Transaction;

// 初始化PayPal客户端
$paypal = new \PayPal\Api\PayPalResourceModel();

// 设置API访问凭证
$paypal->setConfig(array(
    'mode' => 'sandbox', // 使用沙箱环境进行测试
    'client_id' => 'YOUR_CLIENT_ID',
    'client_secret' => 'YOUR_CLIENT_SECRET'
));

// 创建订单详情
$items = array();
$items[0] = new Item();
$items[0]->setName('Item 1')
    ->setPrice('10.00')
    ->setCurrency('USD')
    ->setQuantity(1);

$items[1] = new Item();
$items[1]->setName('Item 2')
    ->setPrice('5.00')
    ->setCurrency('USD')
    ->setQuantity(2);

$itemList = new ItemList();
$itemList->setItems($items);

$details = new Details();
$details->setSubtotal('20.00');

$amount = new Amount();
$amount->setTotal('20.00')
    ->setCurrency('USD')
    ->setDetails($details);

// 创建交易
$transaction = new Transaction();
$transaction->setAmount($amount)
    ->setItemList($itemList)
    ->setDescription('Payment description');

// 创建支付请求
$payer = new Payer();
$payer->setPaymentMethod('paypal');

$payment = new Payment();
$payment->setIntent('sale')
    ->setPayer($payer)
    ->setTransactions(array($transaction));

// 发送支付请求到PayPal
$response = $payment->create($paypal->getApiContext());

// 处理响应
if ($response->getState() == 'created') {
    // 支付请求已成功创建，重定向用户到PayPal进行支付
    $approvalUrl = $response->getApprovalLink();
    header('Location: ' . $approvalUrl);
} else {
    // 处理错误
    echo 'Error: ' . $response->getMessage();
}