当前问题状况
1.验签都没问题。
2.调用接口返回的mweb_url进行跳转支付会提示“系统繁忙请稍后再试”
相关信息
商家订单编号:P403021149815
统一下单返回JSON：
{ "device_info":"", "trade_type":"MWEB", "prepay_id":"wx28171531512997b4b6a4454b1749678400", "code_url":"", "mweb_url":"https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx28171531512997b4b6a4454b1749678400&package=2321104470", "appid":"wx8a0651b7622f05dd", "mch_id":"1601193892", "sub_appid":"", "sub_mch_id":"", "nonce_str":"f2IveBfFJhUvjgll", "sign":"94FDB6977613AB567B45689B883728CB", "result_code":"SUCCESS", "err_code":"", "err_code_des":"", "return_code":"SUCCESS", "return_msg":null, "ResultXml":"<xml>rn <return_code><![CDATA[SUCCESS]]></return_code>rn <return_msg><![CDATA[OK]]></return_msg>rn <appid><![CDATA[wx8a0651b7622f05dd]]></appid>rn <mch_id><![CDATA[1601193892]]></mch_id>rn <nonce_str><![CDATA[f2IveBfFJhUvjgll]]></nonce_str>rn <sign><![CDATA[94FDB6977613AB567B45689B883728CB]]></sign>rn <result_code><![CDATA[SUCCESS]]></result_code>rn <prepay_id><![CDATA[wx28171531512997b4b6a4454b1749678400]]></prepay_id>rn <trade_type><![CDATA[MWEB]]></trade_type>rn <mweb_url><![CDATA[https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx28171531512997b4b6a4454b1749678400&package=2321104470]]></mweb_url>rn</xml>"} 微信支付跳转链接:
https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx28171531512997b4b6a4454b1749678400&package=2321104470&redirect_url=http%3a%2f%2ftest.datang1pin.cn 
1，请确认同一个MWEB_URL只被一个微信号调起，如果不同微信号调起请重新下单生成新的MWEB_URL
2，如MWEB_URL有添加redirect_url，请确认参数拼接格式是否有误，是否有对redirect_url的值做urlencode,可对比以下例子格式：
https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx20161110163838f231619da20804912345&package=1037687096&redirect_url=https%3A%2F%2Fwww.wechatpay.com.cn