How does the site access micro-channel public number JSAPI pay PHP version

1. First of all, we need to have a public micro-channel number (classification of types of subscription number, service number, company number) of our public micro-channel number must be a service number only it only makes micro-channel payment interface ..

And the public micro-channel number must be certified micro letter to apply for micro-channel payment interface.

2. Application JSAPI products

3. After the application is successful but also to the public micro-channel number configured at the function settings

The domain business domain name and domain name and web security interfaces js authoritative name are you doing to fill micro-channel payment function can be accessed if the Web site domain name

4. You get into the micro-channel micro-channel merchant payment number. Products -> Configure development product configuration

Fill in your website address invoking the public micro-channel number as https://www.baidu.com/ payment method name / parameter value to

5. Such basic payment environment has built a good course on the development of micro-channel can have a basic reference document into expensive environment to build , can be developed.

The steps are: 1. When developing JSAPI payment, you must get the call to the user's openid unified under a single interface and cached (not every time gained)

public function pay(){
        vendor('pay.WxPayData');
        vendor('pay.JsApiPay');
        vendor('pay.WxPayApi');
        vendor('pay.WxPayConfig');
        vendor('pay.WxPayNotify');
        $orderModel = M('weiz_order');
        //①、获取用户openid
    try{
        $tools = new \JsApiPay();
        $openId = $tools->GetOpenid();
        if(empty($openId)&&$openId ==""){
            if(session('expire_time')>time()){
                $openId = session('openId');
            }    
        }else{
            session('openId',$openId);
            session('expire_time',time()+300);//300秒过期时间
        }

2.调用微信支付的统一下单接口

/②、统一下单
        $input = new \WxPayUnifiedOrder();
        $input->SetBody($body);//body商品描述
        $input->SetAttach("附加数据");//attahch附加数据暂时不用附加数据
        $input->SetOut_trade_no($out_trade_no);//out_trade_no商户订单号
        $input->SetTotal_fee($total_fee);//订单总金额
        $input->SetTime_start(date("YmdHis",time()));//交易开始时间
        $input->SetTime_expire(date("YmdHis", time() + 600));//交易结束时间prepay_id只有两小时的有效期
        $input->SetGoods_tag("无");//订单优惠标记暂时无
        $input->SetNotify_url("http://event.com/index.php/Weixinpay/NotifyProcess");//异步回调地址不能携带参数
        $input->SetTrade_type("JSAPI");//交易类型JSAPI
        $input->SetOpenid($openId);//通过code来获取用户标识openID
        $config = new \WxPayConfig();//获取商户配置
        $order = \WxPayApi::unifiedOrder($config, $input);
        //统一下单接口返回的预支付交易会话标识
        $jsApiParameters = $tools->GetJsApiParameters($order);//获取jsapi支付的参数(json格式)

3.将获取到的预支付交易会话标识$jsApiParameters 分配给客户端只有这个标识才能调起微信支付（所以这个参数很重要如果为空则支付失败）

4.前台拿到预支付交易会话标识后进行调起微信支付其实按照JSAPI字面意思就是通过客户端的JS来调用支付API

$(function(){
            
            function onBridgeReady(){
                // alert(JSON.stringify(jsapi));
                   WeixinJSBridge.invoke(
                       'getBrandWCPayRequest',{$jsApiParameters},
              function(res){
                  if(res.err_msg == "get_brand_wcpay_request:ok" ){
                  // 使用以上方式判断前端返回,微信团队郑重提示：
                //res.err_msg将在用户支付成功后返回ok，但并不保证它绝对可靠。
                var authToken = $('.authToken').val();
                  }else if (res.err_msg == "get_brand_wcpay_request:cancel"){
                          $('.pay-fail-content').css('display','block');
                          $(".tip").fadeIn();
                        setInterval(function(){
                        $('.tip').fadeOut(5000);
                        },3000);//延迟3s执行tip谈出        
                  }else{
                      //处理支付失败的逻辑
                      var wid = $('.wid').val();
                  }
               }); 
           }

5.当然微信支付提供了多个接口如查询订单，退款等不同的接口看项目需求。这里异步通知和同步通知就不写在这了自己可以百度和查看微信开发文档

6.JSAPI支付功能常见错误是

　　a.微信公众号配置错误

b,微信商户号产品配置错误（支付授权目录）

c.统一下单接口请求参数要确保和微信开发平台一致

d.后台与客户端的预支付交易标识参数的传递出现了问题

最后建议测试工具使用微信开发工具进行测试虽然其没有权限调起微信这支付但能查出你的问题所在

谢谢!

How does the site access micro-channel public number JSAPI pay PHP version

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