Paypal支持集成thinkphp5 PayPal-PHP-SDK插件

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paypal支付接口准备工作

首先去申请一个paypal账号，https://www.paypal.com/。
申请完毕并登录，进入https://developer.paypal.com/developer/accounts/。即可看到你申请账号自动配属的两个测试账号，账号类别分别是：BUSINESS和PERSONAL，PERSONAL的账号里面有$9999，测试费用，表激动。
下面去给两个账号设置密码，点击账号展开，然后点击Profile，会弹出账号信息框，里面可以设置密码等一堆属性。如果点击账号始终无法展开，请吐槽下paypal，然后F5再点。
下面进入https://developer.paypal.com/developer/applications/申请APP，点击REST API apps栏目下面的Create App按钮，写进一个APP名称，然后选择一个测试账户作为此APP绑定的账号，如果你在上一步没有申请新的测试账号，那么这里默认就是选择了BUSINESS账号。
然后打开创建的APP，可以看到APP的clientId和clientSecret。
paypal的测试环境域名为sandbox.paypal.com，正式域名为www.paypal.com。一下测试均为测试环境。

至此准备工作差不多了，开始动代码。

PayPal-PHP-SDK下载：https://packagist.org/packages/paypal/rest-api-sdk-php

通过composer（composer安装教程）下载PayPal-PHP-SDK，具体的composer.json如下：

composer require paypal/rest-api-sdk-php

{
    "require" : {
        "paypal/rest-api-sdk-php" : "1.7.4"
    },
    "repositories": {
        "packagist": {
            "type": "composer",
            "url": "https://packagist.phpcomposer.com"
        }
    }
}

二。注册开发者帐号、创建应用

1. 创建应用

2. 获取应用配置

shndbox 为沙盒环境配置，live 反之

3. 创建测试帐号

点击 create account 设置测试帐号金额和密码

PayPal Payments的逻辑大致如下：

创建一个支付，发送到paypal服务端
paypal服务端返回一个用户授权地址
转链到用户授权地址，用户授权

用户授权完毕，paypal返回到客户端设置的execute地址，付款实现。

<?php

namespace app\pay\controller;
use PayPal\Api\Payer;
use PayPal\Api\Item;
use PayPal\Api\ItemList;
use PayPal\Api\Details;
use PayPal\Api\Amount;
use PayPal\Api\Transaction;
use PayPal\Api\RedirectUrls;
use PayPal\Api\Payment;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Exception\PayPalConnectionException;
use PayPal\Rest\ApiContext;
use PayPal\Api\PaymentExecution;


use cmf\controller\HomeBaseController;

class PaypalController extends HomeBaseController
{
    const clientId = '';//ID

    const clientSecret = '';//秘钥

    const accept_url = 'http://test.pay.com/PayPal/Callback';//回调地址

    const Currency = 'USD';//币种

    const error_log = 'PayPal-error.log';//错误日志

    const success_log = 'PayPal-success.log';//成功日志

    protected $PayPal;

    public function __construct()
    {

        $this->PayPal = new ApiContext(
            new OAuthTokenCredential(
                self::clientId,
                self::clientSecret
            )
        );

        $this->PayPal->setConfig(
            array(
                'mode' => 'live',
                'http.ConnectionTimeOut' => 30,
            )
        );
    }

    public function index()
    {
        $product = input('product');
        if (empty($product)) {
            return json(['status'=>false,'msg'=>'商品不能为空']);
        }

        $price = input('price');
        if (empty($price)) {
            return json(['status'=>false,'msg'=>'价格不能为空']);
        }

        $shipping = input('shipping', 0);


        $description = input('description');
        if (empty($description)) {
            return json(['status'=>false,'msg'=>'描述内容不能为空']);
        }

        $this->pay($product, $price, $shipping, $description);
    }

    /**
     * @param
     * $product 商品
     * $price 价钱
     * $shipping 运费
     * $description 描述内容
     */
    public function pay($product, $price, $shipping = 0, $description)
    {
        $paypal = $this->PayPal;

        $total = $price + $shipping;//总价

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

        $item = new Item();
        $item->setName($product)->setCurrency(self::Currency)->setQuantity(1)->setPrice($price);

        $itemList = new ItemList();
        $itemList->setItems([$item]);

        $details = new Details();
        $details->setShipping($shipping)->setSubtotal($price);

        $amount = new Amount();
        $amount->setCurrency(self::Currency)->setTotal($total)->setDetails($details);

        $transaction = new Transaction();
        $transaction->setAmount($amount)->setItemList($itemList)->setDescription($description)->setInvoiceNumber(uniqid());

        $redirectUrls = new RedirectUrls();
        $redirectUrls->setReturnUrl(self::accept_url . '?success=true')->setCancelUrl(self::accept_url . '/?success=false');

        $payment = new Payment();
        $payment->setIntent('sale')->setPayer($payer)->setRedirectUrls($redirectUrls)->setTransactions([$transaction]);

        try {
            $payment->create($paypal);
        } catch (PayPalConnectionException $e) {
            echo $e->getData();
            die();
        }

        $approvalUrl = $payment->getApprovalLink();
        header("Location: {$approvalUrl}");
    }

    /**
     * 回调
     */
    public function Callback()
    {
        $success = trim($_GET['success']);

        if ($success == 'false' && !isset($_GET['paymentId']) && !isset($_GET['PayerID'])) {
            pay_logs(self::error_log, '取消付款');
            exit();
        }

        $paymentId = trim($_GET['paymentId']);
        $PayerID = trim($_GET['PayerID']);

        if (!isset($success, $paymentId, $PayerID)) {
            pay_logs(self::error_log, '支付失败');
            exit();
        }

        if ((bool)$_GET['success'] === 'false') {
            pay_logs(self::error_log, '支付失败，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】');
            exit();
        }

        $payment = Payment::get($paymentId, $this->PayPal);

        $execute = new PaymentExecution();

        $execute->setPayerId($PayerID);

        try {
            $payment->execute($execute, $this->PayPal);
        } catch (Exception $e) {
            pay_logs(self::error_log, $e . ',支付失败，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】');
            exit();
        }
        pay_logs(self::success_log, '支付成功，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】');
    }


}

同步回调 - 用于确认用户是否付款

/**
     * 回调
     */
    public function Callback()
    {
        $success = trim($_GET['success']);

        if ($success == 'false' && !isset($_GET['paymentId']) && !isset($_GET['PayerID'])) {
            echo '取消付款';die;
        }

        $paymentId = trim($_GET['paymentId']);
        $PayerID = trim($_GET['PayerID']);

        if (!isset($success, $paymentId, $PayerID)) {
            echo '支付失败';die;
        }

        if ((bool)$_GET['success'] === 'false') {
            echo  '支付失败，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】';die;
        }

        $payment = Payment::get($paymentId, $this->PayPal);

        $execute = new PaymentExecution();

        $execute->setPayerId($PayerID);

        try {
            $payment->execute($execute, $this->PayPal);
        } catch (Exception $e) {
            echo ',支付失败，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】';die;
        }
        echo '支付成功，支付ID【' . $paymentId . '】,支付人ID【' . $PayerID . '】';die;
    }

异步回调 - 用于处理业务逻辑

要先在控制面板设置回调地址，必须为 Https, 设置后要等一会才会生效

异步回调

public function notify(){

        //获取回调结果
        $json_data = $this->get_JsonData();

        if(!empty($json_data)){
             Log::debug("paypal notify info:\r\n".json_encode($json_data));
        }else{
            Log::debug("paypal notify fail:参加为空");
        }
          //自己打印$json_data的值看有那些是你业务上用到的
          //比如我用到
          $data['invoice'] = $json_data['resource']['invoice_number'];
          $data['txn_id'] = $json_data['resource']['id'];
          $data['total'] = $json_data['resource']['amount']['total'];
          $data['status'] = isset($json_data['status'])?$json_data['status']:'';
          $data['state'] = $json_data['resource']['state'];

        try {
                 //处理相关业务
        } catch (\Exception $e) {
            //记录错误日志
            Log::error("paypal notify fail:".$e->getMessage());

            return "fail";
        }
        return "success";
    }

    public function get_JsonData(){
        $json = file_get_contents('php://input');
        if ($json) {
            $json = str_replace("'", '', $json);
            $json = json_decode($json,true);
        }
        return $json;
    }

退款

public function returnMoney()
    {

        try {
            $txn_id = "xxxxxxx";  //异步加调中拿到的id
            $amt = new Amount();
            $amt->setCurrency('USD')
                ->setTotal('99');  // 退款的费用

            $refund = new Refund();
            $refund->setAmount($amt);

            $sale = new Sale();
            $sale->setId($txn_id);

            $refundedSale = $sale->refund($refund, $this->PayPal);
        } catch (\Exception $e) {
            // PayPal无效退款
            return json_decode(json_encode(['message' => $e->getMessage(), 'code' => $e->getCode(), 'state' => $e->getMessage()]));  // to object
        }
        // 退款完成
        return $refundedSale; 
    }

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