前言：之前一直爲web跳轉微信支付二搜索百度，居然沒有得到想要的結果，所以現在給出以下解決方案。
其實微信的H5支付就是可以解決這個問題的
1，公衆號首先開通H5支付；
2，通過微信“統一支付訂單”api請求
#1.生成字符串：
appid=wx12a881c60697&attach=sd&body=測試&device_info=wx&goods_tag=asdsd&mch_id=128521402&nonce_str=8991731¬ify_url=http://www.hhh.com&out_trade_no=20180906101016&sign_type=MD5&spbill_create_ip=58.42.243.5&time_expire=20180908101133&time_start=20180906101133&total_fee=1&trade_type=MWEB
#2.連接商戶key：
appid=wx12a881c60697&attach=sd&body=測試&device_info=wx&goods_tag=asdsd&mch_id=128521402&nonce_str=8991731¬ify_url=http://www.hhh.com&out_trade_no=20180906101016&sign_type=MD5&spbill_create_ip=58.42.243.5&time_expire=20180908101133&time_start=20180906101133&total_fee=1&trade_type=MWEB&key=987987987asdfdasf
#3.md5編碼並轉成大寫：
sign=D89552C4391EED648F9E07F3B07B0751
#4.對body做utf-8編碼（不是url編碼）
最終提交的xml：
<xml>
<appid>wx12a881c60697</appid>
<attach>sd</attach>
<body>測試</body>
<device_info>wx</device_info>
<goods_tag>asdsd</goods_tag>
<mch_id>128521402</mch_id>
<nonce_str>8991731</nonce_str>
<notify_url>http://www.hhh.com</notify_url>
<out_trade_no>20180906101016</out_trade_no>
<sign_type>MD5</sign_type>
<spbill_create_ip>58.42.243.5</spbill_create_ip>
<time_expire>20180908101133</time_expire>
<time_start>20180906101133</time_start>
<total_fee>1</total_fee>
<trade_type>MWEB</trade_type>
<sign>D89552C4391EED648F9E07F3B07B0751</sign>
</xml>
請求地址：https://api.mch.weixin.qq.com/pay/unifiedorder
請求返回：
<xml><return_code><![CDATA[SUCCESS]]></return_code>
<return_msg><![CDATA[OK]]></return_msg>
<appid><![CDATA[wx12a881c60697]]></appid>
<mch_id><![CDATA[128521402]]></mch_id>
<device_info><![CDATA[wx]]></device_info>
<nonce_str><![CDATA[CMesZ4kcK8nKIBg6]]></nonce_str>
<sign><![CDATA[2AFF460DC8394BBAD5C855DE9B88F666]]></sign>
<result_code><![CDATA[SUCCESS]]></result_code>
<prepay_id><![CDATA[wx06110302299753e417cbfb4d3746332941]]></prepay_id>
<trade_type><![CDATA[MWEB]]></trade_type>
<mweb_url><![CDATA[https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx06110302299753e417cbfb4d3746332941&package=4027105385]]></mweb_url>
</xml>
3，請求返回的mweb_url就是我們最終需要的連接，我用手機瀏覽器和app直接打開此鏈接可以正常打開微信進行支付；
4，其實在第三部以上就可以正常使用了，但是我好奇，就抓包分析一下得到如下數據
通過請求一下地址，注意要加上Referer參數。
https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx06110302299753e417cbfb4d3746332941&package=4027105385
返回的數據如下：
<!DOCTYPE html>
<html>
<head lang="en">
<meta http-equiv=Content-Type content="text/html;charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="format-detection" content="telephone=no">
<title>weixin</title>
<style>.f10{font-size:10px}.f11{font-size:11px}.f12{font-size:12px}.f13{font-size:13px}.f14{font-size:14px}.f15{font-size:15px}.f16{font-size:16px}.f17{font-size:17px}.f18{font-size:18px}.f19{font-size:19px}.f20{font-size:20px}body{font-size:14px}h1,h2,h3,h4,h5{font-weight:400;font-style:normal}h1,.h1{font-size:20px}h2,.h2{font-size:18px}h3,.h3{font-size:16px}h4,.h4{font-size:14px}h5,.h5{font-size:12px}a,a:visited{color:#007aff}.text_color{color:#888}.title_color{color:#000}.desc{color:#b2b2b2}.warn{color:#b71414}.nickname{color:#576b95}.tips{font-size:13px;color:#b2b2b2}body{background-color:#fff}body.msg_dark{background-color:#2e3132;color:#fff}.page_msg{padding:75px 15px 0;text-align:center}.icon_area{margin-bottom:19px}.text_area{margin-bottom:25px}.text_area .title{margin-bottom:12px}.opr_area{margin-bottom:25px}.extra_area{margin-bottom:20px}@media screen and (min-height:416px){.extra_area{position:fixed;left:0;bottom:0;width:100%}}.btn{display:block;margin-left:auto;margin-right:auto;padding-left:14px;padding-right:14px;font-size:16px;text-align:center;text-decoration:none;overflow:visible;height:40px;border-radius:5px;-moz-border-radius:5px;-webkit-border-radius:5px;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;color:#fff;line-height:40px;-webkit-tap-highlight-color:rgba(255,255,255,0)}.btn.btn_inline{display:inline-block}.btn_default{background-color:#d1d1d1}.btn_default:not(.btn_disabled):visited{color:#fff}.btn_default:not(.btn_disabled):active{color:rgba(255,255,255,.4);background-color:#a7a7a7}.btn_primary{background-color:#04be02}.btn_primary:not(.btn_disabled):visited{color:#fff}.btn_primary:not(.btn_disabled):active{color:rgba(255,255,255,.4);background-color:#039702}.btn_warn{background-color:#ef4f4f}.btn_warn:not(.btn_disabled):visited{color:#fff}.btn_warn:not(.btn_disabled):active{color:rgba(255,255,255,.4);background-color:#c13e3e}.btn.btn_mini{height:25px;line-height:25px;font-size:14px}button.btn,input.btn{width:100%;border:0;outline:0;-webkit-appearance:none}button.btn:focus,input.btn:focus{outline:0}button.btn_inline,input.btn_inline{width:auto}.btn_disabled{color:rgba(255,255,255,.6)}.btn+.btn{margin-top:10px}.btn.btn_inline+.btn.btn_inline{margin-top:auto;margin-left:10px}.btn_area{margin-left:-5px;margin-right:-5px;font-size:0}.btn_area.btn_area_inline{margin-left:auto;margin-right:auto;display:-webkit-box;display:-webkit-flex;display:-moz-box;display:-ms-flexbox;display:flex}.btn_area.btn_area_inline .btn{margin-top:auto;margin-right:10px;width:100%;-webkit-box-flex:1;-webkit-flex:1;-moz-box-flex:1;-ms-flex:1;box-flex:1;flex:1;display:inline-block \9;width:48% \9;margin-left:1% \9;margin-right:1% \9}.btn_area.btn_area_inline .btn:last-child{margin-right:0}span.btn button{display:block;width:100%;height:100%;background-color:transparent;border:0;outline:0;color:#fff}span.btn button:active{color:rgba(255,255,255,.4)}span.btn.btn_loading button,span.btn.btn_disabled button{color:#fff}.icon_msg{width:100px;height:100px;vertical-align:middle;display:inline-block;border-radius:50%;-moz-border-radius:50%;-webkit-border-radius:50%}.icon_msg.warn{background-color:#f86161;color:#fff;font-size:60px;font-style:normal}html{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{font:14px/1.5em "Helvetica Neue",Helvetica,Arial,sans-serif;background-color:#efeff4;line-height:1.6}body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,fieldset,textarea{margin:0}fieldset,legend,textarea,input,button{padding:0}button,input,select,textarea{font-family:inherit;font-size:100%;margin:0;*font-family:"Helvetica Neue",Helvetica,Arial,sans-serif}ul,ol{padding-left:0;list-style-type:none}a img,fieldset{border:0}a{text-decoration:none}</style>
</head>
<body>
<div class="body">
<div id="errpage" class="page_msg">
</div>
</div>
<script src="//wx.gtimg.com/wxpay_h5/fingerprint2.min.1.4.1.js"></script>
<script type="text/javascript">
var is_postmsg="";
if( 0!==0 && is_postmsg=="1" )
{
parent.postMessage(JSON.stringify({
action : "send_deeplink_fail",
data : {
deeplink : ""
},
error : {
error_code : "0",
error_msg : "ok"
}
}), "");
}
if( 0===0)
{
window.onload=function()
{
// var fp=new Fingerprint2();
// fp.get(function(result)
{
// var fingerprint="";
/* if(fingerprint!=result && fingerprint)
{
document.getElementById("errpage").innerHTML='<div class="icon_area"><i class="icon_msg warn">!</i></div> \
<div class="text_area"> \
<h2 id="111" class="title"> '+result+'網絡環境未能通過安全驗證，請稍後再試</h2> \
</div>';
return;
}*/
var is_postmsg="";
if(is_postmsg=="1")
{
parent.postMessage(JSON.stringify({
action : "send_deeplink",
data : {
deeplink : "weixin://wap/pay?prepayid%3Dwx061040101593518ac1f0ddc61295444268&package=3242339213&noncestr=1536201747&sign=1d861e648b025e36118319fca263e29c"
}
}), "");
}
else
{
var url="weixin://wap/pay?prepayid%3Dwx061040101593518ac1f0ddc61295444268&package=3242339213&noncestr=1536201747&sign=1d861e648b025e36118319fca263e29c";
var redirect_url="";
top.location.href=url;
if(redirect_url)
{
setTimeout(
function(){
top.location.href=redirect_url;
},
5000
);
}
else
{
setTimeout(
function(){
window.history.back();
},
5000);
}
}
}
// );
}
}
</script>
</body>
</html>
在以上數據可以看到：
weixin://wap/pay?prepayid%3Dwx061040101593518ac1f0ddc61295444268&package=3242339213&noncestr=1536201747&sign=1d861e648b025e36118319fca263e29c
到此數據分析完畢，此鏈接我們是不能直接生成的，而是要通過第四部請求微信後返回得到。
源文地址：
https://blog.csdn.net/yunwu009/article/details/82457907