`微信支付分为四步：

1、获取code

2、获取opendi

3、获取相应数据得到商品订单数组

4、支付返回(js 判断)

PHP语言:

include("includes/modules/payment/WxPayPubHelper.php");

//使用jsapi接口

$jsApi = new JsApi_pub();

//=========步骤1：网页授权获取用户openid============

//通过code获得openid

if (!isset($_GET['code']))

{

//触发微信返回code码

$url = $jsApi->createOauthUrlForCode(WxPayConf_pub::JS_API_CALL_URL);

ecs_header("Location: $url");

}else

{

//获取code码，以获取openid

$code = $_GET['code'];

$jsApi->setCode($code);

$openid = $jsApi->getOpenId();

if(!empty($openid)){

include_once('includes/lib_clips.php');

include_once('includes/lib_payment.php');

获取订单信息

}

$unifiedOrder = new UnifiedOrder_pub();

//设置统一支付接口参数

//设置必填参数

//appid已填,商户无需重复填写

//mch_id已填,商户无需重复填写

//noncestr已填,商户无需重复填写

//spbill_create_ip已填,商户无需重复填写

//sign已填,商户无需重复填写

$unifiedOrder->setParameter("openid","$openid");//商品描述

$out_trade_no = $order['order_sn'];

$unifiedOrder->setParameter("body","$goods_name");//商品描述

//自定义订单号，此处仅作举例

//$timeStamp = time();

//$out_trade_no = WxPayConf_pub::APPID."$timeStamp";

$total_fee = $total['amount']*100;

$unifiedOrder->setParameter("out_trade_no","$out_trade_no");//商户订单号

$unifiedOrder->setParameter("total_fee","$total_fee");//总金额

$unifiedOrder->setParameter("notify_url",WxPayConf_pub::NOTIFY_URL);//通知地址

$unifiedOrder->setParameter("trade_type","JSAPI");//交易类型

//非必填参数，商户可根据实际情况选填

//$unifiedOrder->setParameter("sub_mch_id","XXXX");//子商户号

//$unifiedOrder->setParameter("device_info","XXXX");//设备号

//$unifiedOrder->setParameter("attach","XXXX");//附加数据

//$unifiedOrder->setParameter("time_start","XXXX");//交易起始时间

//$unifiedOrder->setParameter("time_expire","XXXX");//交易结束时间

//$unifiedOrder->setParameter("goods_tag","XXXX");//商品标记

//$unifiedOrder->setParameter("openid","XXXX");//用户标识

//$unifiedOrder->setParameter("product_id","XXXX");//商品ID

$prepay_id = $unifiedOrder->getPrepayId();

//=========步骤3：使用jsapi调起支付============

$jsApi->setPrepayId($prepay_id);

$jsApiParameters = $jsApi->getParameters();

//$jsApiParameters = json_encode($jsApiParameters);

$smarty->assign('pay_online', $jsApiParameters);

JavaScript语言:

<script type="text/javascript">

//调用微信JS api 支付

function jsApiCall()

{

WeixinJSBridge.invoke(

'getBrandWCPayRequest',

{$pay_online},

function(res){

WeixinJSBridge.log(res.err_msg);

if(res.err_msg == "get_brand_wcpay_request:ok"){

//alert(res.err_code+res.err_desc+res.err_msg);

window.location.href="http://blog.sina.com.cn/u/1863605217";

}else{

//返回跳转到订单详情页面

alert(支付失败);

window.location.href="http://blog.sina.com.cn/u/1863605217";

}

}

);

}

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>`