app-api/app/Handlers/RefundAmount.php

<?php
namespace App\Handlers;

use App\Models\OrderRefundMoneyW;
use App\Models\OrderW;
use App\Models\Store;
use App\Models\DwbsUser;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;

Class RefundAmount
{
    public function refundAmount($order_id){
       $order=OrderW::where('id',$order_id)->first();
       $order_no=$order->order_no;
       $sub_mchid=Store::withTrashed()->where('is_failure',0)->where('id',$order->store_id)->value('sub_mchid');
       if(empty($sub_mchid)){
           return ['450001','店铺信息有误，暂不能退款'];
       }
       if(in_array($order->status,[1,2,3]) && $order->is_pay==1){
           $amount=["refund"=> (int) ($order->pay_money*100),"total"=> (int)($order->pay_money*100),"currency"=> "CNY"];
       }else{
           return ['450001','订单状态有误，暂不能退款'];
       }
       $handler=new SignHandler();
       $url='https://api.mch.weixin.qq.com/v3/ecommerce/refunds/apply';//申请退款地址
       $merchant_id=config('wechat.payment.default.mch_id');//商户号
       $serial_no=config('wechat.payment.default.serial_no');//不是平台证书序列号
       $mch_private_key=$handler->getPublicKey();//读取商户api证书公钥 getPublicKey()获取方法 见下文
       $timestamp=time();//时间戳
       $nonce=$handler->nonce_str();//随机字符串
        if($order->rand_no){
            $out_trade_no=$order->rand_no.'_'.$order_no;
        }else{
            $out_trade_no=$order_no;
        }
       $data=[
           'sub_mchid'=>$sub_mchid,
           'sp_appid'=>config('wechat.payment.default.app_id'),
           'transaction_id'=>$order->wechat_pay_no,
//           'out_trade_no'=> $out_trade_no,
           'out_refund_no'=> 'TK'.substr($order_no,2),
           'amount'=> $amount,
           'notify_url'=>url('api/miniSub/refund_notify')
       ];
       Log::info(json_encode($data));
       $sign=$handler->sign($url,'POST',$timestamp,$nonce,json_encode($data),$mch_private_key,$merchant_id,$serial_no);//签名
       $header=[
           'Authorization:WECHATPAY2-SHA256-RSA2048 ' . $sign,
           'Accept:application/json',
           'User-Agent:' . $merchant_id,
           'Content-Type:application/json',
           'Wechatpay-Serial:' . $handler->getzhengshu()//获取平台证书序列号
       ];
       $result=$handler->curl($url,json_encode($data),$header,'POST');
       $result=json_decode($result,true);
       Log::info(json_encode($result));
       if(isset($result['refund_id']) && !empty($result['refund_id'])){
//           OrderW::where('order_no',$order_no)
//               ->update(['refund_status'=>'START','refund_no'=>$result['refund_id'],'refund_time'=>$result['create_time']]);
           OrderRefundMoneyW::create([
               'order_no'=>$order_no,
               'refund_status'=>'START',
               'refund_time'=>$result['create_time'],
               'refund_no'=>$result['refund_id'],
               'refund_account'=>null,
               'refund_amount'=>null
           ]);
       }else{
           return ['450000',$result['message']];
       }
   }
}