PHP语言开发Paypal支付demo的具体实现，phppaypal支付demo

如果我们的应用是面向国际的、那么支付的时候通常会考虑使用paypal。以下为个人写的一个paypal支付示例，已亲测可行。paypal有个很不错的地方就是为开发者提供了sandbox（沙箱）测试功能。（即为开发者在开发环境提供了一个虚拟的卖家账户和金额、以及一个虚拟的买家账户和金额、虚拟卡号等。能够让我们不用使用真实的金钱进行测试。）

一、开发前准备

https://developer.paypal.com/ 到paypal的开发者官网注册开发者账号。
用账号登录之后、点击导航上面的 dashboard、进入dashboard面版。如下截图、后续的操作都是在这个面板中操作。
上面截图中菜单 Sandbox下面的Accounts里面能看到你的 sandbox测试的买家账号和卖家账号。2个测试账号里面都有profile选项里面有changepassword可以设置虚拟账号的密码。
上面截图中菜单Sandbox下面的Transactions就是你的交易记录。
点击截图页面右上角的 Create App按钮。创建一个应用。创建好后、会给你提供一个Client ID 和 Secret。这两个可以配置为php常量后面开发中会用到。

二、进入支付Demo开发

随便在本地建立一个开发代码根目录、先建立一个index.html里面就放一个简单的产品名称和产品价格两个input项即可、代码和截图如下：

<span><!</span><span>DOCTYPE html</span><span>></span>
<span><</span><span>html </span><span>lang</span><span>="en"</span><span>></span>
    <span><</span><span>head</span><span>></span>
        <span><</span><span>meta </span><span>charset</span><span>="utf-8"</span><span>></span>
        <span><</span><span>title</span><span>></span>支付页面<span></</span><span>title</span><span>></span>
    <span></</span><span>head</span><span>></span>
    <span><</span><span>body</span><span>></span>
        <span><</span><span>div</span><span>></span>
            <span><</span><span>form </span><span>action</span><span>="checkout.php"</span><span> method</span><span>="post"</span><span> autocomplete</span><span>="off"</span><span>></span>
                <span><</span><span>label </span><span>for</span><span>="item"</span><span>></span><span>
                    产品名称
                    </span><span><</span><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="product"</span><span>></span>
                <span></</span><span>label</span><span>></span>
                <span><</span><span>br</span><span>></span>
                <span><</span><span>label </span><span>for</span><span>="amount"</span><span>></span><span>
                    价格
                    </span><span><</span><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="price"</span><span>></span>
                <span></</span><span>label</span><span>></span>
                <span><</span><span>br</span><span>></span>
                <span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="去付款"</span><span>></span>
            <span></</span><span>form</span><span>></span>
        <span></</span><span>div</span><span>></span>
    <span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

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输入产品名称和价格。点击去付款就会到paypal的付款页面。用你的sandbox测试买家账号去付款。就会发现付款成功。然后登陆你的测试卖家账号。会发现卖家账号已经收到付款。当然这里会扣除paypal收取的手续费。手续费收的是卖家的。
下面来具体看看php是怎么实现的。首先先要把paypal提供的 php-sdk给弄到你的代码目录中来。这里介绍使用php的包管理器composer来获取最新sdk、当然你可以可以从github等其他渠道获取最新的paypal php-sdk。
默认你的电脑已经安装composer了。如果没有自己去度娘或者google下composer安装。
然后在你的代码根目录写一个composer.json文件来获取包内容。json文件代码如下：
```
{
 "require" : {
 "paypal/rest-api-sdk-php" : "1.5.1"
 }
}
```
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这里如果是 linux/unix系统就直接再根目录执行composer install来获取包内容。
安装好之后。根目录下面会产生一个vendor目录。里面有composer 和 paypal两个子目录。composer里面实现了自动加载、paypal则是你的sdk内容。
接下来我们来写一个公共文件（这里默认用 app/start.php、你的项目中可以自定义)、其实里面就只是实现了 sdk的autoload.php自动加载和创建刚才上面的的client id 和 secret生成的paypal支付对象实例。start.php代码如下：

<?<span>php
</span><span>require</span> "vendor/autoload.php"; <span>//</span><span>载入sdk的自动加载文件</span>
<span>define</span>('SITE_URL', 'http://www.paydemo.com'); <span>//</span><span>网站url自行定义
//创建支付对象实例</span>
<span>$paypal</span> = <span>new</span><span> \PayPal\Rest\ApiContext(
    </span><span>new</span><span> \PayPal\Auth\OAuthTokenCredential(
        </span>'你的Client ID'
        '你的secret'<span>
    )
);</span>

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接下来就来实现表单中提交的处理文件 checkout.php。代码内容如下：

<?<span>php
</span><span>/*</span><span>*
 * @author xxxxxxxx
 * @brief 简介：
 * @date 15/9/2
 * @time 下午5:00
 </span><span>*/</span>
<span>use</span><span> \PayPal\Api\Payer;
</span><span>use</span><span> \PayPal\Api\Item;
</span><span>use</span><span> \PayPal\Api\ItemList;
</span><span>use</span><span> \PayPal\Api\Details;
</span><span>use</span><span> \PayPal\Api\Amount;
</span><span>use</span><span> \PayPal\Api\Transaction;
</span><span>use</span><span> \PayPal\Api\RedirectUrls;
</span><span>use</span><span> \PayPal\Api\Payment;
</span><span>use</span> \PayPal\<span>Exception</span><span>\PayPalConnectionException;

</span><span>require</span> "app/start.php"<span>;
</span><span>if</span> (!<span>isset</span>(<span>$_POST</span>['product'], <span>$_POST</span>['price'<span>])) {
    </span><span>die</span>("lose some params"<span>);
}
</span><span>$product</span> = <span>$_POST</span>['product'<span>];
</span><span>$price</span> = <span>$_POST</span>['price'<span>];
</span><span>$shipping</span> = 2.00; <span>//</span><span>运费</span>

<span>$total</span> = <span>$price</span> + <span>$shipping</span><span>;

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

</span><span>$item</span> = <span>new</span><span> Item();
</span><span>$item</span>->setName(<span>$product</span><span>)
    </span>->setCurrency('USD'<span>)
    </span>->setQuantity(1<span>)
    </span>->setPrice(<span>$price</span><span>);

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

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

</span><span>$amount</span> = <span>new</span><span> Amount();
</span><span>$amount</span>->setCurrency('USD'<span>)
    </span>->setTotal(<span>$total</span><span>)
    </span>->setDetails(<span>$details</span><span>);

</span><span>$transaction</span> = <span>new</span><span> Transaction();
</span><span>$transaction</span>->setAmount(<span>$amount</span><span>)
    </span>->setItemList(<span>$itemList</span><span>)
    </span>->setDescription("支付描述内容"<span>)
    </span>->setInvoiceNumber(<span>uniqid</span><span>());

</span><span>$redirectUrls</span> = <span>new</span><span> RedirectUrls();
</span><span>$redirectUrls</span>->setReturnUrl(SITE_URL . '/pay.php?success=true'<span>)
    </span>->setCancelUrl(SITE_URL . '/pay.php?success=false'<span>);

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

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

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

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checkout.php通过表单提交上来的参数对支付具体细节和参数进行初始化和设置。这里只列出了常用的部分。paypal提供了很多参数设置。具体更丰富的可以自己参考paypal官方开发者文档。

checkout.php设置完参数之后。会生成一个支付链接。用header跳转到这个支付链接（就是paypal的支付页面）到这个支付页面上面就可以用你的sandbox提供的buyer账号去支付了。截图如下：
用buyer账号支付完成之后。去看看你的sandbox的商家账户余额吧。就会发现已经收到了扣除手续费外的钱了。
这里支付成功或者失败后还有一个回调的处理。回调处理的php文件再上面的checkout.php里面的setReturnUrl处设置。这里设置的是/pay.php?success=true
接下来我们来看看pay.php是怎么简单处理回调的。先贴上pay.php的代码：

<?<span>php

</span><span>require</span> 'app/start.php'<span>;

</span><span>use</span><span> PayPal\Api\Payment;
</span><span>use</span><span> PayPal\Api\PaymentExecution;

</span><span>if</span>(!<span>isset</span>(<span>$_GET</span>['success'], <span>$_GET</span>['paymentId'], <span>$_GET</span>['PayerID'<span>])){
    </span><span>die</span><span>();
}

</span><span>if</span>((bool)<span>$_GET</span>['success']=== 'false'<span>){

    </span><span>echo</span> 'Transaction cancelled!'<span>;
    </span><span>die</span><span>();
}

</span><span>$paymentID</span> = <span>$_GET</span>['paymentId'<span>];
</span><span>$payerId</span> = <span>$_GET</span>['PayerID'<span>];

</span><span>$payment</span> = Payment::get(<span>$paymentID</span>, <span>$paypal</span><span>);

</span><span>$execute</span> = <span>new</span><span> PaymentExecution();
</span><span>$execute</span>->setPayerId(<span>$payerId</span><span>);

</span><span>try</span><span>{
    </span><span>$result</span> = <span>$payment</span>->execute(<span>$execute</span>, <span>$paypal</span><span>);
}</span><span>catch</span>(<span>Exception</span> <span>$e</span><span>){
    </span><span>die</span>(<span>$e</span><span>);
}
</span><span>echo</span> '支付成功！感谢支持!';

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好了。到这里一个简单的paypal支付的demo其实已经走通了。懂得支付原理之后、想要再你自己的项目里面进行更丰富的扩展、就去paypal的官方文档查看更多具体的开发项设置。包括交易明细的获取等等都是可以实现的。这里就不具体讲下去了。