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我用作曲家安装了PayPal SDK，但我的php文件CHECKOUT.php出现错误：

致命错误：在第23行的C：\ xampp \ htdocs \ pagos \ checkout.php中找不到类“ Paypal \ Api \ Payer”

checkout.php：

<?php
require ("start.php");

use Paypal\Api\Payer;
use Paypal\Api\Item;

$payer = new Payer();
$payer->setPaymentMethod("paypal");

$item = new Item();
$item->setName($descripcion)
    ->setCurrency('MXN')
    ->setQuantity(1)
    ->setPrice($precio);
$itemList = new ItemList();
$itemList->setItems([$item]);

start.php

<?php
// 1. Autoload the SDK Package. This will include all the files and classes to your autoloader
// Used for composer based installation
require __DIR__  . '/vendor/autoload.php';
// Use below for direct download installation
// require __DIR__ …