支付宝退款接口对接流程PHP语言

先分享一下支付宝退款的程序源码(我这段代码是通过配置证书而不是字符串秘钥的方式)

sdk下载地址：https://opendocs.alipay.com/open/54/103419#%E8%8E%B7%E5%8F%96%20Alipay%20SDK

public function refund($refund)

{$appCertPath = THINK_PATH."Library/Vendor/alipay-sdk-PHP-4.9.1/aop/cert/appCertPublicKey_2016********2148.crt";$alipayCertPath = THINK_PATH."Library/Vendor/alipay-sdk-PHP-4.9.1/aop/cert/alipayCertPublicKey_RSA2.crt";$rootCertPath = THINK_PATH."Library/Vendor/alipay-sdk-PHP-4.9.1/aop/cert/alipayRootCert.crt";require_once THINK_PATH.'Library/Vendor/alipay-sdk-PHP-4.9.1/aop/AopCertClient.php';require_once THINK_PATH.'Library/Vendor/alipay-sdk-PHP-4.9.1/aop/request/AlipayTradeRefundRequest.php';$aop = new\AopCertClient();//网关与证书配置

$aop->gatewayUrl = 'https://openapi.alipay.com/gateway.do';$aop->appId = '应用id';$aop->rsaPrivateKey = '用工具生成的RSA私钥，去头去尾去空格';$aop->alipayrsaPublicKey=$aop->getPublicKey($alipayCertPath);//'请填写支付宝公钥，一行字符串';

$aop->isCheckAlipayPublicCert = true;$aop->appCertSN = $aop->getCertSN($appCertPath);$aop->alipayRootCertSN = $aop->getRootCertSN($rootCertPath);//算法编码与格式配置

$aop->apiVersion = '1.0';$aop->signType = 'RSA2';$aop->postCharset='UTF-8';$aop->format='json';//参数内容配置

$request = new\AlipayTradeRefundRequest ();$parameter = array("out_trade_no"=>$this->payInfo['order_id'],//自己商城系统内的订单号，也是原来被付款的订单号

"refund_amount"=>$this->payInfo['amount'],//退款金额

"refund_reason"=>"正常退款");$request->setBizContent(json_encode($parameter));$result = $aop->execute ( $request);$responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";$resultCode = $result->$responseNode->code;

//以下是退款成功后的回调商城对应的操作，与支付宝退款无关$orderRefund = newOrderRefund();if(!empty($resultCode)&&$resultCode == 10000){$orderRefund->returnOkCallback($refund,"成功提交退款至支付宝账户");

}else{$orderRefund->returnErrorCallback($refund,"提交退款至支付宝账户失败");

}

}

1.首先你在支付宝平台上要有自己的应用，https://open.alipay.com/platform/developerIndex.htm，没有则创建

$aop->appId 即我们创建的应用id

2.配置秘钥，下载官方工具生成，文档地址：https://opendocs.alipay.com/open/291/105971，生成证书也在该文档中

$aop->rsaPrivateKey

3.参数内容中我还有一个订单的详情内容没有配置，只是一个简单的退款，如果你想丰富你的退款商品或者订单信息，查看官方退款接口文档

https://opendocs.alipay.com/apis/api_1/alipay.trade.refund

4.在线调试地址：https://openhome.alipay.com/platform/demoManage.htm#/alipay.trade.refund

遇到的坑汇总一下

1.明明信息都是对的，接口返回证书错误，更改了sdk中一处精度的问题，AopCertClient.php的135行

/**

* 0x转高精度数字

* @param $hex

* @return int|string*/

function hex2dec($hex)

{$dec = 0;$len = strlen($hex);for ($i = 1; $i <= $len; $i++) {$dec = bcadd($dec, bcmul(strval(hexdec($hex[$i - 1])), bcpow('16', strval($len - $i))));

}//return round($dec,0);

return $dec;

}

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