集成paypal支付接口的，对象是海外用户，全部用US的信用卡结算； 项目结束的时候就有想法写一篇网站集成paypal的简易教程，方便以后的各位开发者

修改的文件路径是\vendor\codeages\biz-order-pay\src\Pay\Payment；
增加PalPayGateway.php文件

<?php
namespace Codeages\Biz\Pay\Payment;
use Codeages\Biz\Framework\Service\Exception\AccessDeniedException;
use Codeages\Biz\Framework\Service\Exception\InvalidArgumentException;
use Codeages\Biz\Framework\Util\ArrayToolkit;
class PalPayGateway extends AbstractGateway
{
//**在线案例演示地址：http://all.zkdygl.com/course/20**protected $url = 'https://www.sandbox.paypal.com/cgi-bin/webscr';（沙盒环境）protected $wapUrl = 'https://www.sandbox.paypal.com/cgi-bin/webscr';（沙盒环境）
//    protected $url = 'https://www.paypal.com/cgi-bin/webscr';（正式环境）
//    protected $wapUrl = 'https://www.paypal.com/cgi-bin/webscr';（正式环境）protected $isWap = false;public function createTrade($data){if (!ArrayToolkit::requireds($data, array('goods_title','goods_detail','attach','trade_sn','amount','notify_url','return_url','create_ip',))) {throw new InvalidArgumentException('trade args is invalid.');}$platformType = empty($data['platform_type']) ? 'Web' : $data['platform_type'];if ($platformType == 'Wap') {$this->url = $this->wapUrl;$this->isWap = true;}$data = $this->convertParams($data);return array('url' => "",'data' => $data);}private function verified($data){$req = 'cmd=_notify-validate';if(function_exists('get_magic_quotes_gpc')) $get_magic_quotes_exists = true;foreach ($data as $key => $value) {if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1){$value = urlencode(stripslashes($value));}else{$value = urlencode($value);}$req.= "&$key=$value";}$ch = curl_init($this->url);curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);curl_setopt($ch, CURLOPT_POSTFIELDS, $req);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));$res = curl_exec($ch);if (strcmp ($res, "VERIFIED") == 0) {return true;} else if (strcmp ($res, "INVALID") == 0) {return false;}}public function converterNotify($data){$res = $this->verified($data);if (!$res) {return array(array('status' => 'failture','notify_data' => $data,),'fail');}if ($data['payment_status'] == 'Completed') {return array(array('status' => 'paid','cash_flow' => $data['payer_id'],'paid_time' => time(),'pay_amount' => (int)($data['payment_gross'] * 100),'cash_type' => 'USD','trade_sn' => $data['invoice'],'attach' => array(),'notify_data' => $data,),json_encode(array('ret_code' => '0000','ret_msg' => '交易成功')));}return array(array('status' => 'failture','notify_data' => $data,),'fail');}public function applyRefund($data){throw new AccessDeniedException('can not apply refund with lianlianpay.');}public function queryTrade($tradeSn){return null;}public function converterRefundNotify($data){throw new AccessDeniedException('can not convert refund notify with Palpay.');}protected function signParams($params, $options){return $this->getSetting();//  return $setting['signatureToolkit']->signParams($params, $options);}protected function makeForm($params){$setting = $this->getSetting();$formHtml = '<form style="text-align:center;" id="form1" name="form1" action="'.$this->url.'" method="post" class="paypal">' ."<input type='hidden' name='cmd' value='_xclick'>" .//告诉paypal该表单是立即购买"<input type='hidden' name='business' value='".$setting['account']."'>" .//卖家帐号 也就是收钱的帐号"<input type='hidden' name='item_name' value='".$params['name_goods']."'>" .//商品名称 item_number"<input type='hidden' name='item_number' value='1'>" .//物品号 item_number"<input type='hidden' name='amount' value='".$params['money_order']."'>" .// 订单金额"<input type='hidden' name='currency_code' value='USD'>" .// 货币"<input type='hidden' name='return' value='".$params['url_return']."'>" .// 支付成功后网页跳转地址"<input type='hidden' name='return' value='".$params['url_return']."'>" .// 支付成功后网页跳转地址"<input type='hidden' name='notify_url' value='".$params['notify_url']."'>" .//支付成功后paypal后台发送订单通知地址"<input type='hidden' name='cancel_return' value='".$params['url_return']."'>" .//用户取消交易返回地址"<input type='hidden' name='invoice' value='".$params['no_order'] ."'>" .//自定义订单号"<input type='hidden' name='charset' value='utf-8'>" .// 字符集"<input type='hidden' name='no_shipping' value='1'>" .// 不要求客户提供收货地址"<input type='hidden' name='no_note' value=''>" .// 付款说明"<input type='hidden' name='rm' value='2'>" ."</form><script type='text/javascript'>function load_submit(){document.form1.submit()}load_submit();</script>";return $formHtml;}protected function convertParams($params){$setting = $this->getSetting();$converted                 = array();$converted['busi_partner'] = '101001';$converted['dt_order']     = date('YmdHis', time());$converted['money_order']  = round($params['amount']/100/7.0755,2);$converted['name_goods']   = $this->filterText($params['goods_title']);$converted['no_order']     = $params['trade_sn'];if (!empty($params['notify_url'])) {$converted['notify_url'] = $params['notify_url'];}$converted['sign_type']    = 'RSA';$converted['version']      = '1.0';$converted['oid_partner']  = $setting['oid_partner'];$converted['user_id']      = $params['attach']['identify_user_id'];$converted['timestamp']    = date('YmdHis', time());if (!empty($params['return_url'])) {$converted['url_return'] = $params['return_url']."?sn=".$_POST['orderSn'];}if (empty($params['attach']['bindPhone'])) {$params['attach']['bindPhone'] = '';}$converted['risk_item']  = json_encode(array('frms_ware_category'=>1008,'user_info_mercht_userno'=>$params['attach']['identify_user_id'],'user_info_dt_register'=>date('YmdHis', $params['attach']['user_created_time']),'user_info_bind_phone' => $params['attach']['bindPhone']));$converted['userreq_ip'] = str_replace(".", "_", $params['create_ip']);$converted['bank_code']  = '';$converted['pay_type']   = '3';$converted['sign']       = $this->signParams($converted, $setting);$converted['formHtml']       = $this->makeForm($converted);return $converted;}protected function filterText($text){preg_match_all('/[\x{4e00}-\x{9fa5}A-Za-z0-9.]*/iu', $text, $results);$title = '';if ($results) {foreach ($results[0] as $result) {if (!empty($result)) {$title .= $result;}}}return $title;}}
}

在线案例演示地址：http://all.zkdygl.com/course/20
1、edusoho新版后台的界面，配置PayPal支付参数信息，主要还是商户邮箱

2、配置完之后，在前台测试课程购买的支付过程

3、选择PayPal支付订单，直接跳转到PayPal支付的页面！！！！！

4、支付完之后，就会进行回调，系统显示支付成功