Server error: `POST https://api.mch.weixin.qq.com/sandboxnew/pay/unifiedorder` resulted in a `504 Gateway Time-out` response:\n<html>\r\n<head><title>504 Gateway Time-out</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>504 Gateway Time-out</h1>< (truncated...)\n
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