微信商家转账到零钱，出口IP不能用

还是自己来解决吧。
前述文档中eip过于简略，详见HX里HBuilderX\plugins\hbuilderx-language-services\builtin-dts\node_modules\@dcloudio\types\uni-cloud-server\extension\eip.d.ts。
贴上代码，供大家参考吧。注意eip的返回值，一开始就掉这个坑里的，然后转request再转回eip。

async transfer(params) {  
    ...  
    const platformCert = await this._getPlatformCert()  
    return await this._requestEip(  
        '/v3/transfer/batches',   
        params,  
        'POST',  
        { 'Wechatpay-Serial': platformCert.certificate.serialNumber })  
}  

async _requestEip (action, params, method = 'GET', successStatusCode = 200, headersExtra = {}) {  
    params = camel2snakeJson(params)  
    const authorization = this._getAuthorization(method, action, params)  
    let { statusCodeValue: status, body: data = {}, headers } = await uniCloud.httpProxyForEip.postJson(  
        `${this._baseURL}${action}`,  
        params,  
        {  
            Accept: 'application/json',  
            'content-type': 'application/json',  
            Authorization: authorization,  
            ...headersExtra  
    })  

    if (status !== successStatusCode) {  
      throw new UniCloudError({  
        code: data.code,  
        message: data.message  
      })  
    }  
    if (!data) data = {}  
    // 响应签名验证  
    await this._verifyResponseSign(headers, data)  

    if (data.appid) data.appId = data.appid  
    if (data.mchid) data.mchId = data.mchid  

    return snake2camelJson(data)  
  }

返回

{ Error: errCode: NOT_ENOUGH | errMsg: 资金不足  
    at c._requestEip (/tmp/function/@common_modules/uni-pay/index.js:33:162198)  
    at <anonymous>  
    at process._tickCallback (internal/process/next_tick.js:189:7) errMsg: '资金不足', errCode: 'NOT_ENOUGH' }

说明调用已经正确了。

另外unipay中微信公共证书每个启动实例都要下载一次，可能太频繁了，腾讯的示例里是60分钟。