unipay使用微信支付v3商户向微信用户转账时无可用的平台证书

uin-pay版本 "version": "2.4.2",

在用vk框架中，写了一个云函数，主要功能是后台审核通过后， 商户向微信用户转账奖金。

Error: request fail：无可用的平台证书，请在商户平台-API安全申请使用微信支付公钥。

main: async (event) => {  
        let { data = {}, userInfo, util, filterResponse, originalParam } = event;  
        let { customUtil, uniID, config, pubFun, vk, db, _, $ } = util;  
        let { uid } = data;  
        let res = { code: 0, msg: "" };  
        // 业务逻辑开始-----------------------------------------------------------          
        let unipayIns = util.uniPay.initWeixinV3(config['uni-pay'].wxpay.app);   

        let out_bill_no= '2ab07867116d4bf9b692435e1735ea53';  
        let transferRes = await unipayIns.request({    
            method: "POST",    
            // 阿里云空间需要设置为true    
            useEipProxy: true,//false,   
            url: "/v3/fund-app/mch-transfer/transfer-bills",    
            data: {    
                appid: config['uni-pay'].wxpay.app.appId,    
                out_bill_no: out_bill_no,    
                openid:"obuDW64WJIRvagZUtzKDez_Z_mVY",//'user-openid',    
                transfer_amount: 10,//以分为单位  
                transfer_remark: "转账测试",    
                transfer_scene_id: "1000",  
                user_recv_perception: "现金奖励",    
                transfer_scene_report_infos: [{    
                        info_type: "活动名称",    
                        info_content: "新会员有礼"    
                    },    
                    {    
                        info_type: "奖励说明",    
                        info_content: "注册会员抽奖一等奖"    
                    }    
                ]    
            }    
        });  
        // 业务逻辑结束-----------------------------------------------------------  
        return res;  
    }  
}

配置如下：

{  
    "appId": "wx1d0cf7073520ade4",  
    "secret": "36114ea32178230b3df497fbd7a5fd4e",  
    "mchId": "1712229422",  
    "key": "e148f986ed5384717dda57fdf0de11ad",  
    "pfx": Buffer(2774),  
    "v3Key": "e048f986ed5384717dda57fdf1de11ad",  
    "appCertPath": "D:\\project\\wechat-online\\wxClient3\\uni_modules\\uni-config-center\\uniCloud\\cloudfunctions\\common\\uni-config-center\\uni-pay\\wxpay\\apiclient_cert.pem",  
    "appPrivateKeyPath": "D:\\project\\wechat-online\\wxClient3\\uni_modules\\uni-config-center\\uniCloud\\cloudfunctions\\common\\uni-config-center\\uni-pay\\wxpay\\apiclient_key.pem",  
    "wxpayPublicKeyPath": "D:\\project\\wechat-online\\wxClient3\\uni_modules\\uni-config-center\\uniCloud\\cloudfunctions\\common\\uni-config-center\\uni-pay\\wxpay\\pub_key.pem",  
    "wxpayPublicKeyId": "PUB_KEY_ID_0117024494022024122000395111111888",  
    "version": 3  
}