使用达达即时配送方案，在预下单（https://api.weixin.qq.com/cgi-bin/express/local/business/order/pre_add?access_token=ACCESS_TOKEN）时，出现2003错误，错误返回如下： {"resultcode":2003,"resultmsg":"签名错误","fee":0,"deliverfee":0,"tips":0,"insurancefee":0,"distance":0,"delivery_token":"","dispatch_duration":0} 请求信息如下（$data）： {     "cargo": {         "goods_value": "97.80",         "goods_weight": "3",         "goods_pickup_info": "",         "goods_delivery_info": "",         "cargo_first_class": "\u65e5\u7528\u767e\u8d27",         "cargo_second_class": "\u5ba0\u7269\u7528\u54c1"     },     "delivery_sign": "a6967774e37d812ca9d887efce235ce5606540d3",     "delivery_id": "DADA",     "openid": "o7OLI5V-JEIH-5qwuonh-ThNCinA",     "order_info": {         "order_type": "0"     },     "receiver": {         "name": "\u5f20\u4e09",         "city": "\u5357\u4eac",         "address": "\u5e7f\u5dde\u5e02\u6d77\u73e0\u533a\u65b0\u6e2f\u4e2d\u8def397\u53f7",         "address_detail": "\u5e7f\u5dde\u5e02\u6d77\u73e0\u533a\u65b0\u6e2f\u4e2d\u8def397\u53f7",         "phone": "020-81167888",         "lng": "113.3237686157",         "lat": "23.0964202881"     },     "shop_id": "dadae5e77242bf27905",     "shop_order_id": "110",     "shop_no": "39160-433264",     "shop": {         "wxa_path": "\/historyOrderDetail\/historyOrderDetail?order_id=110",         "img_url": "https:\/\/cyanlake.cn\/crd\/shopImg\/1\/coverImg.jpg",         "goods_name": "\u9752\u6e56\u6d4b\u8bd5\u5e97",         "goods_count": "10"     } } 达达提供的appkey：$dada_shop_id="dadae5e77242bf27905";$dada_app_secret="如需要可提供"; 加密算法：$delivery_sign=sha1($dada_shop_id.$shop_order_id.$dada_app_secret); ------------------------------------------------- 请求发送： $data = array(//主参数构建 "cargo"=>$cargo, "delivery_sign"=>$delivery_sign, "delivery_id"=>$delivery_id, "openid"=>$user_openid, "order_info"=>$order_info, "receiver"=>$receiver, "shop_id" =>$dada_shop_id, "shop_order_id"=>$shop_order_id, "shop_no"=>$dadaID, "shop"=>$shop );  $url="https://api.weixin.qq.com/cgi-bin/express/local/business/order/pre_add?access_token=".$accessToken; $data=json_encode($data,JSON_UNESCAPED_UNICODE); $options = array( 'http' => array( 'method' => 'POST', 'header'=>"Content-type: application/x-www-form-urlencoded;charset=gb2312\r\n".     "Content-length:".strlen($data)."\r\n", 'content' => $data, ) ); $context = stream_context_create($options); $codeinfo = file_get_contents($url,false,$context); 服务器使用php7.3