https://api.mch.weixin.qq.com/pay/unifiedorder
统一下单的接口，交易结束时间 time_expire ， 【。。。由于在请求支付的时候有一个必传参数prepay_id只有两小时的有效期，所以在重入时间超过2小时的时候需要重新请求下单接口获取新的prepay_id。。。。】但是 二维码就是在 获取 prepay_id 的时候获取的，意思是 二维码最长 只有 2小时有效期吗？在线等，急
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