请教一个微信公众账号平台支付的问题
问个好先
最近接收一个微信项目，以前也没碰过，突然间支付那块儿出问题了，微信的JSAPI支付接口也就是WeixinJSBridge.invoke("getBrandWCPayRequest".....这个东西一直返回：get_brand_wcpay_request:fail，然后就没有然后了。
我去公众平台官网技术文档的JSAPI技术文档看了下，看的云里雾里，跟我项目里代码完全不一样，后来才知道我那个项目里的是微信支付V2版本，官网里的是V3，然后我又在“https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6”找到一个H5网页调用JS支付的一个文档，不幸的是，看起来跟我调用的很像，但参数还是不一样，貌似也是V3的。百度了一下这个关键词“get_brand_wcpay_request:fail”，还有说新版微信不支持这种调用了，但不确定，因为官网没说不能用。
所以现在我的处境根本就是绝境，既不知道到底我那部分代码能不能用，也找不到任何有帮助的信息，也不干升级支付，我看了升级支付还设计好多东西。现在无可奈何，寻求帮助，希望有这方面经验的前辈不吝赐教！
我真是很奇怪，从来没有见过这么混乱的技术文档，这是什么玩意儿。太恼火。
回复内容：
问个好先
最近接收一个微信项目，以前也没碰过，突然间支付那块儿出问题了，微信的JSAPI支付接口也就是WeixinJSBridge.invoke("getBrandWCPayRequest".....这个东西一直返回：get_brand_wcpay_request:fail，然后就没有然后了。
我去公众平台官网技术文档的JSAPI技术文档看了下，看的云里雾里，跟我项目里代码完全不一样，后来才知道我那个项目里的是微信支付V2版本，官网里的是V3，然后我又在“https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6”找到一个H5网页调用JS支付的一个文档，不幸的是，看起来跟我调用的很像，但参数还是不一样，貌似也是V3的。百度了一下这个关键词“get_brand_wcpay_request:fail”，还有说新版微信不支持这种调用了，但不确定，因为官网没说不能用。
所以现在我的处境根本就是绝境，既不知道到底我那部分代码能不能用，也找不到任何有帮助的信息，也不干升级支付，我看了升级支付还设计好多东西。现在无可奈何，寻求帮助，希望有这方面经验的前辈不吝赐教！
我真是很奇怪，从来没有见过这么混乱的技术文档，这是什么玩意儿。太恼火。
微信支付现在分为v2版和v3版，2014年9月10号之前申请的为v2版，之后申请的为v3版。V3版的微信支付没有paySignKey参数。
两个版本取决于申请时间，是不能转换的，代码和流程也有很大的不同。
现在调用微信的jsapi需要先通过权限验证，你这个问题的解决办法就是使用微信的jssdk进行jsapi支付，但服务端的微信支付代码还是用原来的。
微信V2升级V3不难，V3在支付参数少了财付通那边的key,然后官方有对应语言的源码提供，都是可行的。直接修改里面的参数就能运行，如果你是C#，你可以到我们群里来交流。217073730
php 和 c# 微信支付官网都有现成的DEMO，改几个参数就能用。你可以先试试官方的demo,看能不能正常运行。
https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=11_1
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