通过PHP对接京东工业平台API接口，快速实现退款申请功能！

<?php
require "oauth.php"; // 引入oauth类库
require "HttpClient.php"; // 引入HttpClient类库

$appKey = "your_app_key"; // 替换成您申请到的API key
$appSecret = "your_app_secret"; // 替换成您申请到的secret key

$apiUrl = "https://api.jd.com/routerjson"; // 接口的URL

// 生成授权对象
$oauthClient = new OAuth($appKey, $appSecret);
$oauthClient->setUrl($apiUrl);
// 设置请求参数
$params = array(
  "param_name1" => "param_value1",
  "param_name2" => "param_value2",
  // 更多参数...
);
// 获取签名
$sign = $oauthClient->generateSign($params);
// 添加签名到请求参数中
$params["sign"] = $sign;
// 发送请求
$httpCient = new HttpClient();
$response = $httpCient->send($apiUrl, $params);
// 处理返回结果
$result = json_decode($response, true);

// 处理返回结果
if ($result["code"] == "0") {
    $refundOrderId = $result["data"]["refundOrderId"];
    $refundStatus = $result["data"]["refundStatus"];
    // 根据退款状态来进行相应的处理
    if ($refundStatus == "SUCCESS") {
        echo "退款成功！退款订单号为：".$refundOrderId;
    } elseif ($refundStatus == "FAIL") {
        echo "退款失败！退款订单号为：".$refundOrderId;
    } else {
        echo "退款处理中，请耐心等待。退款订单号为：".$refundOrderId;
    }
} else {
    echo "退款申请失败，错误信息为：".$result["message"];
}