ThinkPHP 5接入PayPal 支付，PayPal的流程是服务器请求Paypal的接口下单（需要传订单id/支付成功的重定向地址/支付失败的重定向地址），接会返回一个支付地址，项目服务器把地址返给用户，用户打开链接登录Paypal完成付款，然后Paypal给重定向到指定地址。

在paypal官网开通商户号，设置通知地址。

开通沙箱模式用于测试，后台会给沙箱模式生成商户账号和用户账号，请注意区分。

申请和开通网上有教程不在赘述。

具体实现步骤如下

1.安装包

composer require paypal/rest-api-sdk-php:*

2.具体实现代码

<?phpnamespace app\api\controller;use app\common\controller\Api;
use app\common\model\ShopOrder;
use PayPal\Api\Amount;
use PayPal\Api\Payer;
use PayPal\Api\Payment;
use PayPal\Api\Transaction;
use PayPal\Api\PaymentExecution;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Rest\ApiContext;
use PayPal\Api\RedirectUrls;
use think\Log;
class Paypal extends Api
{protected $noNeedLogin = ['*'];protected $noNeedRight = ['*'];private $apiContext;public function __construct(){parent::__construct();// 初始化PayPal API上下文$this->apiContext = new ApiContext(new OAuthTokenCredential('AV8d**************************N-jbpRvV-K0_dLuEA5d8uodUowab6jdWtM',     // 客户端ID'EByrRAncAi*****************************RSqIRA'         // 客户端密钥));$this->apiContext->setConfig(['mode' => 'sandbox',      // 或者 'live'// 其他配置...]);}/*** 下单接口* @return \think\response\Json|void* @throws \think\db\exception\DataNotFoundException* @throws \think\db\exception\ModelNotFoundException* @throws \think\exception\DbException*/public function createPaypalPaymentUrl(){// 获取前端传递的order_Id$orderId = input('post.order_id');// 查询订单信息（这里你需要根据自己的数据库结构进行查询）// 假设我们得到了一个包含订单详情的数组$orderInfo$orderInfo = ShopOrder::where('id', $orderId)->where('status', '1')->find();if (empty($orderInfo)) {$this->error('订单不存在或不是待支付状态');}// 设置Payer信息，表明付款人是通过PayPal付款$payer = new Payer();$payer->setPaymentMethod("paypal");// 设置交易金额$amount = new Amount();$amount->setCurrency("AUD")->setTotal(number_format($orderInfo['actual_money'], 2, '.', ''));// 创建Transaction对象，并使用订单ID作为发票号$transaction = new Transaction();$transaction->setAmount($amount)->setDescription("Slem order pay")  // 描述可选->setInvoiceNumber($orderInfo->order_num);  // 使用订单order_num作为发票号// 创建RedirectUrls对象$redirectUrls = new RedirectUrls();$redirectUrls->setReturnUrl("https://*******.cn/api/paypal/paymentSuccess")  // 支付成功后的回调地址->setCancelUrl("https://********/api/paypal/paymentCancel");  // 用户取消支付后的回调地址// 创建Payment对象$payment = new Payment();$payment->setIntent("sale")->setPayer($payer)->setRedirectUrls($redirectUrls)->setTransactions([$transaction]);try {// 创建支付请求$payment->create($this->apiContext);// 获取approval_url，这是用户需要访问来完成支付的URLforeach ($payment->getLinks() as $link) {if ($link->getRel() == 'approval_url') {// 返回支付链接给客户端return json(['code' => 1, 'data' => $link->getHref()]);
//                    $data = ['status' => 'success', 'approval_url' => $link->getHref()];
//                    $this->success(__('SUccess'),$data);}}} catch (\Exception $ex) {// 输出详细的错误信息return json(['status' => 'error','message' => 'Error creating PayPal payment: ' . $ex->getMessage(),'details' => $ex->getTraceAsString(),'response' => $payment->toArray()]);}}/*** 支付成功跳转的页面* 建议前端出个html后台做渲染，本方法只为展示流程* @return \think\response\Json*/public function paymentSuccess(){// 获取PayPal传递过来的参数$paymentId = input('get.paymentId');$payerId = input('get.PayerID');if (empty($paymentId) || empty($payerId)) {return json(['status' => 'error', 'message' => 'Missing payment ID or payer ID']);}try {// 获取支付信息$payment = Payment::get($paymentId, $this->apiContext);// 创建PaymentExecution对象并设置payer_id$execution = new PaymentExecution();$execution->setPayerId($payerId);// 执行支付请求$result = $payment->execute($execution, $this->apiContext);// 检查支付状态if ($result->getState() === 'approved') {// 使用发票号（即订单ID）来查找订单$invoiceNumber = $payment->getTransactions()[0]->getInvoiceNumber();$order = ShopOrder::where('order_num', $invoiceNumber)->find();if (!empty($order)) {// 更新订单状态为已支付$order->payment = 'paypal';$order->status = '2';$order->save();// 你可以在这里添加更多的业务逻辑，比如发送确认邮件等// 返回成功信息给前端return json(['status' => 'success', 'message' => 'Payment successful']);} else {return json(['status' => 'error', 'message' => 'Order not found']);}} else {return json(['status' => 'error', 'message' => 'Payment not approved']);}} catch (\Exception $ex) {// 错误处理Log::error('PayPal Error: ' . $ex->getMessage());return json(['status' => 'error','message' => 'Error executing payment: ' . $ex->getMessage(),'details' => $ex->getTraceAsString()]);}}/*** 支付取消跳转的页面* @return \think\response\Json*/public function paymentCancel(){// 获取订单ID或其他相关信息（如果需要）$orderId = input('get.order_id'); // 如果PayPal回调包含order_idif (!empty($orderId)) {try {// 根据订单ID查找订单信息$order = ShopOrder::where('id', $orderId)->find();if (!empty($order)) {// 你可以在这里添加更多的业务逻辑，比如记录取消原因、发送通知等// 更新订单状态为已取消或保持不变，视业务需求而定// 这里假设我们不改变订单状态，仅记录取消事件Log::info("Payment cancelled for order ID: " . $orderId);// 返回取消信息给前端return json(['status' => 'info', 'message' => 'Payment cancelled.']);} else {return json(['status' => 'error', 'message' => 'Order not found.']);}} catch (\Exception $ex) {// 错误处理Log::error('Error handling payment cancellation: ' . $ex->getMessage());return json(['status' => 'error','message' => 'An error occurred while processing your request.','details' => $ex->getTraceAsString()]);}} else {// 如果没有提供订单ID，则简单地告知用户支付已被取消return json(['status' => 'info', 'message' => 'Payment cancelled.']);}}
}