PHP语言开发Paypal支付demo的具体实现

<ol class="dp-c">
<li class="alt"><span><span>DOCTYPE html> </span></span></li>
<li>
<span>"en"</span><span>> </span>
</li>
<li class="alt"><span>     </span></li>
<li>
<span>        <meta class="string">"utf-8"</span><span>> </span>
</li>
<li class="alt"><span>        <title>支付页面title> </title></span></li>
<li><span>    head> </span></li>
<li class="alt"><span>     </span></li>
<li><span>        <div> <li class="alt">
<span>            <form class="string">"checkout.php"</form></span><span> method=</span><span class="string">"post"</span><span> autocomplete=</span><span class="string">"off"</span><span>> </span>
</li>
<li>
<span>                <label class="keyword">for</label></span><span>=</span><span class="string">"item"</span><span>> </span>
</li>
<li class="alt"><span>                    产品名称 </span></li>
<li>
<span>                    <input class="string">"text"</span><span> name=</span><span class="string">"product"</span><span>> </span>
</li>
<li class="alt"><span>                label> </span></li>
<li><span>                <br> </span></li>
<li class="alt">
<span>                <label class="keyword">for</label></span><span>=</span><span class="string">"amount"</span><span>> </span>
</li>
<li><span>                    价格 </span></li>
<li class="alt">
<span>                    <input class="string">"text"</span><span> name=</span><span class="string">"price"</span><span>> </span>
</li>
<li><span>                label> </span></li>
<li class="alt"><span>                <br> </span></li>
<li>
<span>                <input class="string">"submit"</span><span> value=</span><span class="string">"去付款"</span><span>> </span>
</li>
<li class="alt"><span>            form> </span></li>
<li><span>        div> </span></li>
<li class="alt"><span>    body> </span></li>
<li><span>html> </span></li>
<p style="text-align: center;"></p>
<p>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。</p>
<p>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。</p>
<p>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。</p>
<p>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： </p>

<p><span style="line-height: 1.5 !important;">{<br>
    </span>"require" :<span style="line-height: 1.5 !important;"> {         </span>"paypal/rest-api-sdk-php" : "1.5.1"<span style="line-height: 1.5 !important;"><br>
    }<br>
}</span></p>

<p>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。</p>
<p>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。</p>
<p>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：</p>
php<br>
<p><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">require</span> "vendor/autoload.php"; <span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">//</span><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">载入sdk的自动加载文件</span> <span style="color: rgb(0, 128, 128); line-height: 1.5 !important;">define</span>('SITE_URL', 'http://www.paydemo.com'); <span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">//</span><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">网站url自行定义 //创建支付对象实例</span> <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paypal</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> \PayPal\Rest\ApiContext(     </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> \PayPal\Auth\OAuthTokenCredential(         </span>'你的Client ID'         '你的secret'<span style="line-height: 1.5 !important;"><br>
    )<br>
);</span><span class="cnblogs_code_copy" style="padding-right: 5px; line-height: 1.5 !important;"><br type="_moz">
</span></p>

<p>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：</p>
php
<p><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">/*</span><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">*<br>
* @author xxxxxxxx<br>
* @brief 简介：<br>
* @date 15/9/2<br>
* @time 下午5:00<br>
</span><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">*/</span><br>
<span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Payer;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Item;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\ItemList;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Details;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Amount;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Transaction;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\RedirectUrls;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> \PayPal\Api\Payment;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span> \PayPal\<span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">Exception</span><span style="line-height: 1.5 !important;">\PayPalConnectionException;<br>
<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">require</span> "app/start.php"<span style="line-height: 1.5 !important;">; </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">if</span> (!<span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">isset</span>(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_POST</span>['product'], <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_POST</span>['price'<span style="line-height: 1.5 !important;">])) {     </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">die</span>("lose some params"<span style="line-height: 1.5 !important;">); } </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$product</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_POST</span>['product'<span style="line-height: 1.5 !important;">]; </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$price</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_POST</span>['price'<span style="line-height: 1.5 !important;">]; </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$shipping</span> = 2.00; <span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">//</span><span style="color: rgb(0, 128, 0); line-height: 1.5 !important;">运费</span>  <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$total</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$price</span> + <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$shipping</span><span style="line-height: 1.5 !important;">;  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payer</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Payer(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payer</span>->setPaymentMethod('paypal'<span style="line-height: 1.5 !important;">);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$item</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Item(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$item</span>->setName(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$product</span><span style="line-height: 1.5 !important;">)     </span>->setCurrency('USD'<span style="line-height: 1.5 !important;">)     </span>->setQuantity(1<span style="line-height: 1.5 !important;">)     </span>->setPrice(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$price</span><span style="line-height: 1.5 !important;">);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$itemList</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> ItemList(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$itemList</span>->setItems([<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$item</span><span style="line-height: 1.5 !important;">]);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$details</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Details(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$details</span>->setShipping(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$shipping</span><span style="line-height: 1.5 !important;">)     </span>->setSubtotal(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$price</span><span style="line-height: 1.5 !important;">);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$amount</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Amount(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$amount</span>->setCurrency('USD'<span style="line-height: 1.5 !important;">)     </span>->setTotal(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$total</span><span style="line-height: 1.5 !important;">)     </span>->setDetails(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$details</span><span style="line-height: 1.5 !important;">);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$transaction</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Transaction(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$transaction</span>->setAmount(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$amount</span><span style="line-height: 1.5 !important;">)     </span>->setItemList(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$itemList</span><span style="line-height: 1.5 !important;">)     </span>->setDescription("支付描述内容"<span style="line-height: 1.5 !important;">)     </span>->setInvoiceNumber(<span style="color: rgb(0, 128, 128); line-height: 1.5 !important;">uniqid</span><span style="line-height: 1.5 !important;">());  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$redirectUrls</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> RedirectUrls(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$redirectUrls</span>->setReturnUrl(SITE_URL . '/pay.php?success=true'<span style="line-height: 1.5 !important;">)     </span>->setCancelUrl(SITE_URL . '/pay.php?success=false'<span style="line-height: 1.5 !important;">);  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> Payment(); </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span>->setIntent('sale'<span style="line-height: 1.5 !important;">)     </span>->setPayer(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payer</span><span style="line-height: 1.5 !important;">)     </span>->setRedirectUrls(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$redirectUrls</span><span style="line-height: 1.5 !important;">)     </span>->setTransactions([<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$transaction</span><span style="line-height: 1.5 !important;">]);  </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">try</span><span style="line-height: 1.5 !important;"> {     </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span>->create(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paypal</span><span style="line-height: 1.5 !important;">); } </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">catch</span> (PayPalConnectionException <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$e</span><span style="line-height: 1.5 !important;">) {     </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">echo</span> <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$e</span>-><span style="line-height: 1.5 !important;">getData();     </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">die</span><span style="line-height: 1.5 !important;">(); }  </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$approvalUrl</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span>-><span style="line-height: 1.5 !important;">getApprovalLink(); </span><span style="color: rgb(0, 128, 128); line-height: 1.5 !important;">header</span>("Location: {<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$approvalUrl</span>}");<span class="cnblogs_code_copy" style="padding-right: 5px; line-height: 1.5 !important;"><br type="_moz">
</span></p>

<p>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。</p>
<p>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：</p>
<p style="text-align: center;"></p>
<p>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。</p>
<p>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 </p>
<p>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：</p>

<p>php</p>
<p><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">require</span> 'app/start.php'<span style="line-height: 1.5 !important;">;<br>
<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> PayPal\Api\Payment;<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">use</span><span style="line-height: 1.5 !important;"> PayPal\Api\PaymentExecution;<br>
<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">if</span>(!<span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">isset</span>(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['success'], <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['paymentId'], <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['PayerID'<span style="line-height: 1.5 !important;">])){<br>
    </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">die</span><span style="line-height: 1.5 !important;">();<br>
}<br>
<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">if</span>((bool)<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['success']=== 'false'<span style="line-height: 1.5 !important;">){<br>
<br>
    </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">echo</span> 'Transaction cancelled!'<span style="line-height: 1.5 !important;">;<br>
    </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">die</span><span style="line-height: 1.5 !important;">();<br>
}<br>
<br>
</span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paymentID</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['paymentId'<span style="line-height: 1.5 !important;">];<br>
</span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payerId</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$_GET</span>['PayerID'<span style="line-height: 1.5 !important;">];<br>
<br>
</span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span> = Payment::get(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paymentID</span>, <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paypal</span><span style="line-height: 1.5 !important;">);<br>
<br>
</span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$execute</span> = <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">new</span><span style="line-height: 1.5 !important;"> PaymentExecution();<br>
</span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$execute</span>->setPayerId(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payerId</span><span style="line-height: 1.5 !important;">);<br>
<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">try</span><span style="line-height: 1.5 !important;">{<br>
    </span><span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$result</span> = <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$payment</span>->execute(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$execute</span>, <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$paypal</span><span style="line-height: 1.5 !important;">);<br>
}</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">catch</span>(<span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">Exception</span> <span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$e</span><span style="line-height: 1.5 !important;">){<br>
    </span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">die</span>(<span style="color: rgb(128, 0, 128); line-height: 1.5 !important;">$e</span><span style="line-height: 1.5 !important;">);<br>
}<br>
</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">echo</span> '支付成功！感谢支持!';<span class="cnblogs_code_copy" style="padding-right: 5px; line-height: 1.5 !important;"><br type="_moz">
</span></p>

<p>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。</p>
 
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