php微信退款流程总结

1.发起退款，使用easywechat包,退款时必须有证书,key文件，微信支付平台会在生成API证书时把文件下载到本地，平台没有保存证书及key

$config = [
            'app_id' => 'XXXX',
            'mch_id' => '商户号',
            'key' => 'XXXXXXX',
            'cert_path' => '/mnt/xxx/xxx/cert.pem',//从商家往客户转账、退款等回滚操作都key
            'key_path'  => '/mnt/yy/yy/key.pem',
        ];

   //发起微信退款
public function refund($order) {

         $refundParams = [];
         $refundParams['transactionId'] = $order->transactionId;//微信支付流水号
         $refundParams['refundNumber'] = $order->orderno;//订单号，可选
         $refundParams['total'] = $order->amount * 100;
         $refundParams['refundMoney'] = $order->amount * 100;
         $refundParams['notify_url'] = 'https://退款回调地址';//地址不可带参数

               
               $res = $this->orderRefund($refundParams);

                if ($res['code'] !== 1) {
                    throw new Exception('微信退款失败-'. $res['msg']);
                }


}
               




//发起退款申请
    public function orderRefund($params) {
        $app = Factory::payment($this->config);
        $ret = ['code' => 1];
        //根据支付流水号退款，一笔付款可以分成多次退，但总退款金额不可超过支付时的金额
        $result = $app->refund->byTransactionId($params['transactionId'],
                                        $params['refundNumber'],
                                      $params['total'],
                                      $params['refundMoney'] ,
                                      ['refund_desc' => '用户申请退款','notify_url' => $params['notify_url']]
        );

        if($result['return_code']!='SUCCESS' || $result['result_code']!='SUCCESS'){
            return ['code' => 0, 'msg' => $result['err_code_des']];
        }
        return $ret;

    }

2.支付回调

//引用包
use EasyWeChat\Factory;




//以下是回调处理

public function cbrefund(){



    $config = [
            'app_id' => 'AAAAA',
            'mch_id' => 'XXXXX',
            'key' => 'BBBBBBB',
            'cert_path' => '/mnt/xxxx/xxxx.pem',//服务器绝对地址
            'key_path'  => '/mnt/xxxx/xxx/key.pem',
        ];

$app = Factory::payment($config);

$response = $app->handleRefundedNotify(function($message, $reqInfo, $fail){
           

            //  $regInfo 是解密后的数据，里面有退款单号等
                 
            if ($message['return_code'] === 'SUCCESS') { 
                if ($reqInfo['refund_status'] === 'SUCCESS') {
                    //逻辑处理....



                } elseif ($message['result_code'] === 'FAIL') {
                    return $fail('支付失败');
                }
            } else {
                return $fail('通信失败，请稍后再通知我');
            }

            return true; // 返回处理完成
            

})







}

easywechat包还有很多功能，如有需要可自行搜索了解