thinkphp6如何接入paypal 支付
命令行下载：

composer require paypal/rest-api-sdk-php

这样thinkphp6就接入PayPal支付了
PHP源码实例：

public function zhifu()
	{
	    //palpay的clientId值
	    $clientId = 'clientId值';
	    //palpay的clientSecret值
	    $clientSecret = 'clientSecret值';
	    //获取请求的价格数据
	    $nums = Request::param('num');
	    //获取提交金钱数
	    $nums = substr($nums,1);
	    //加载三方类配置
		require __DIR__  . '/../../vendor/autoload.php';
		//实例化PayPal三方类
		$paypal = new \PayPal\Rest\ApiContext(
			new \PayPal\Auth\OAuthTokenCredential(
			//上线
				$clientId,//clientId
				$clientSecret//clientSecret
    		)
		);
		// 给三方类添加配置
        $paypal->setConfig(
              array(
              	//这里很重要没上线用沙盒，上线用上线
                // 'mode' => 'sandbox',沙盒
                'mode' => 'live',//上线
                //下面是日志配置
                'log.LogEnabled' => true,
                'log.FileName' => 'PayPal.log',
                'log.LogLevel' => 'DEBUG'
              )
        );
        //收款方式
		$payer = new \PayPal\Api\Payer();
		$payer->setPaymentMethod('paypal');
        //收款金额与货币类型
		$amount = new \PayPal\Api\Amount();
		$amount->setTotal($nums);
		$amount->setCurrency('USD');
		//货物描述，可填可不填
		$transaction = new \PayPal\Api\Transaction();
		$transaction->setAmount($amount)->setDescription("支付描述内容");
        //不知道有什么用，好像没什么用，但勿动。
		$redirectUrls = new \PayPal\Api\RedirectUrls();
		$redirectUrls->setReturnUrl("https://example.com/your_redirect_url.html")
		    ->setCancelUrl("https://example.com/your_cancel_url.html");

		$payment = new \PayPal\Api\Payment();
		$payment->setIntent('sale')
		    ->setPayer($payer)
		    ->setTransactions(array($transaction))
		    ->setRedirectUrls($redirectUrls);
		// After Step 3
		try {
		    //支付并返回信息
		    $payment->create($paypal);
		    //打印返回信息
		    dump($payment)
		    //echo $payment->getApprovalLink();打印跳转地址
		    //跳转支付界面
		    return redirect($payment->getApprovalLink());
		}
		catch (\PayPal\Exception\PayPalConnectionException $ex) {
		    // This will print the detailed information on the exception.
		    //REALLY HELPFUL FOR DEBUGGING
		    //打印错误信息
		    dump($ex->getData());
		}
	}