//查询订单详情
        $orderInfo = orderDetailInfo($order_sn,$user_id);
        var_dump($orderInfo);

        //测试支付金额
        if($user_id=="24") $orderInfo[‘total_fee‘]=0.01;

        //调用统一下单api的请求参数
        $jsApiParameters = wxUnifiedOrder($orderInfo[‘order_sn‘],$orderInfo[‘total_fee‘]*100);

        $smarty->assign(‘jsapiparameters‘,$jsApiParameters);
        $smarty->display(‘wxpay.htML‘);


//调用微信统一下单api的js参数
function wxUnifiedOrder($order_sn,$total_fee)
{
    require_once ROOT_PATH . "wxpay/lib/WxPay.Api.PHP";
    require_once ROOT_PATH . "wxpay/example/WxPay.JsApiPay.PHP";
    //require_once ‘LOG.PHP‘;

    //①、获取用户oPEnid
    $tools = new JsApiPay();
    $openId = $tools->GetOpenid();

    //②、统一下单
    $input = new WxPayUnifiedOrder();
    $input->SetOpenid($openId);
    $input->SetBody("XXX公众号购买");
    $input->SetAttach("XXX公众号购买产品$order_sn");
    $input->SetOut_Trade_no($order_sn);
    $input->SetTotal_fee($total_fee);
    $input->SetTime_start(date("YmdHis"));
    $input->SetTime_expire(date("YmdHis",time() + 600));
    $input->SetGoods_tag("XXX公众号购买");
    $input->SetNotify_url("http://XXX.COM/wxshop/wxnotify.PHP");
    $input->SetTrade_type("JSAPI");

    $order = WxPayApi::unifiedOrder($input);

    //PRintf_info($order);

    $jsApiParameters = $tools->GetJsApiParameters($order);

    //③、在支持成功回调通知中处理成功之后的事宜，见 notify.PHP
    /**
     * 注意：
     * 1、当你的回调地址不可访问的时候，回调通知会失败，可以通过查询订单来确认支付是否成功
     * 2、jsapi支付时需要填入用户openid，WxPay.JsApiPay.PHP中有获取openid流程 （文档可以参考微信公众平台“网页授权接口”，
     * 参考http://mp.weixin.QQ.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html）
     */
    return $jsApiParameters;
}

<a class="next BTn SEND_PAY" onclick="callpay()" >立即支付</a>

<script type="text/javascript">
    //调用微信JS api 支付
    function jsApicall()
    {
        WeixinJSbridge.invoke(
            ‘getBrandWCPayRequest‘,{$jsapiparameters},function(res){
            if(res.err_msg == "get_brand_wcpay_request:ok" ){
                layer.open({
                    content: ‘支付成功‘,skin: ‘msg‘,time: 2 //2秒后自动关闭
                });
            }
        }
    );
    }

    function callpay()
    {
        if (typeof WeixinJSBridge == "undefined"){
            if( document.addEventListener ){
                document.addEventListener(‘WeixinJSBridgeReady‘,jsApiCall,false);
            }else if (document.attachEvent){
                document.attachEvent(‘WeixinJSBridgeReady‘,jsApiCall);
                document.attachEvent(‘onWeixinJSBridgeReady‘,jsApiCall);
            }
        }else{
            jsApiCall();
        }
    }
</script>

<?PHP
define(‘IN_ECS‘,true);
require(dirname(__FILE__) . ‘/../../includes/inIT.PHP‘);
ini_set(‘date.timezone‘,‘Asia/Shanghai‘);
error_reporting(E_ERROR);

require_once "../lib/WxPay.Api.PHP";//sdk有这个文件
require_once ‘../lib/WxPay.Notify.PHP‘;//sdk有这个文件
require_once ‘log.PHP‘;//sdk有这个文件

//初始化日志
$logHandler= new CLogFileHandler("../logs/".date(‘Y-m-d‘).‘.log‘);
$log = Log::Init($logHandler,15);

class PayNotifyCallBack extends WxPayNotify
{
    //查询订单
    public function Queryorder($transaction_id)
    {
        $input = new WxPayOrderQuery();
        $input->SetTransaction_id($transaction_id);
        $result = WxPayApi::orderQuery($input);
        Log::DEBUG("query:" . json_encode($result));
        if(array_key_exists("return_code",$result)
            && array_key_exists("result_code",$result)
            && $result["return_code"] == "SUCCESS"
            && $result["result_code"] == "SUCCESS")
        {
            return true;
        }
        return false;
    }

    //重写回调处理函数
    public function NotifyProcess($data,&$msg)
    {
        Log::DEBUG("1");
        Log::DEBUG("call back:" . json_encode($data));
        $notfiyOutput = array();
        Log::DEBUG("2");
        if(!array_key_exists("transaction_id",$data)){
            $msg = "输入参数不正确";
            return false;
        }
        //查询订单，判断订单真实性
        if(!$this->Queryorder($data["transaction_id"])){
            $msg = "订单查询失败";
            return false;
        }

        //如果成功,那么就更改订单状态
        $res = $this->updateOrder($data["out_Trade_no"],$data["transaction_id"]);
        if($res)
        {
            return true;
        }else{
            return false;
        }

    }

    public function updateOrder($order_sn,$Trade_no)
    {//更改订单状态--设置已付款
        /* 取得订单信息 */
        $sql = ‘SELECT order_id,user_id,order_sn,Trade_no,consignee,address,tel,shipping_id,extension_code,extension_id,goods_amount ‘ .
            ‘From t_order_info ‘  .
            " WHERE order_sn = ‘$order_sn‘";
        $order    = $GLOBALS[‘db‘]->getRow($sql);
        $sql = ‘UPDATE t_order_info ‘  .
            " SET order_status = ‘1‘," .
            " confirm_time = ‘" . gmtime() . "‘," .
            " pay_status = ‘2‘," .
            " pay_id = ‘7‘," .
            " pay_name = ‘微信支付‘," .
            " pay_time = ‘".gmtime()."‘," .
            " money_paid = order_amount," .
            " group_buy_status = group_buy_status+1," .
            " Trade_no = ‘$Trade_no‘ ".
            "WHERE order_sn = ‘$order_sn‘";
        $res = $GLOBALS[‘db‘]->query($sql);
        if($res)
        {
            return true;
        }else{
            return false;
        }
    }


}

$notify = new PayNotifyCallBack();//实例化
$notify->Handle(false);//调用这个方法,将来就可以执行上面那个回调方法,并且,获取XMl数据,验证签名,和最后的给微信输出xml,都可以完成

//$resXml = "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml> ";
//echo $resXml;
//Log::DEBUG($resXml);