// 发送单个红包
    $param = ["nonce_str" => \WxPayApi::getNonceStr(),//随机字符串
        "mch_billno" => $this->app_mchid . date('YmdHis') . rand(1000, 9999),//订单号
        "mch_id" => \WxPayConfig::MCHID,//商户号
        "wxappid" => \WxPayConfig::APPID,
        "send_name" => '同仁堂健康',//红包发送者名称
        "re_openid" => $openid,
        "total_amount" => 100,//付款金额，单位分
        "min_value" => 100,//最小红包金额，单位分
        "max_value" => 100,//最大红包金额，单位分
        "total_num" => 1,//红包发放总人数
        "wishing" => '恭喜发财',//红包祝福语
        "client_ip" => '127.0.0.1',//调用接口的机器 Ip 地址
        "act_name" => '红包活动',//活动名称
        "remark" => '快来抢！',//备注信息
    ];
    $wxMchPayHelper = new \WxMchPayHelper($param);
    $r = $wxMchPayHelper->send_redpack();
    
    // 发送裂变红包
    // 注意：发裂变红包不能加不必要的参数：min_value，max_value，client_ip
    $param = ["nonce_str" => \WxPayApi::getNonceStr(),//随机字符串
        "mch_billno" => $this->app_mchid . date('YmdHis') . rand(1000, 9999),//订单号
        "mch_id" => \WxPayConfig::MCHID,//商户号
        "wxappid" => \WxPayConfig::APPID,
        "send_name" => '同仁堂健康',//红包发送者名称
        "re_openid" => $openid,
        "total_amount" => 300,//付款金额，单位分
        "total_num" => 3,//红包发放总人数
        "amt_type" => 'ALL_RAND',//红包金额设置方式，ALL_RAND—全部随机
        "wishing" => '恭喜发财',//红包祝福语
        "act_name" => '红包活动',//活动名称
        "remark" => '快来抢！',//备注信息
    ];
    $wxMchPayHelper = new \WxMchPayHelper($param);
    $r = $wxMchPayHelper->send_group();
    
    // 企业转账给个人
    $param = [
        "nonce_str" => \WxPayApi::getNonceStr(),//随机字符串
        "mchid" => \WxPayConfig::MCHID,//商户号
        "mch_appid" => \WxPayConfig::APPID,
        "partner_trade_no" => $this->genOutTradeNo(),//订单号
        "openid" => $openid,
        "amount" => 100,//付款金额，单位分
        "check_name" => 'NO_CHECK',
            // "re_user_name" => '不知道',//
        "spbill_create_ip" => '127.0.0.1',//调用接口的机器 Ip 地址
        "desc" => '有钱就是任性',//备注信息
    ];
    $wxMchPayHelper = new \WxMchPayHelper($param);
    $r = $wxMchPayHelper->transfers();