应工作需要，要对接退款的功能 但是现在这个退款接口 提示400 这是什么问题
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- Upload Refund Voucher: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- Notes on WeChat Pay Signature: Mini Program/Development/Extended/API/New API for Multiterminal Framework/WeChat Pay
- Calling address: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- request: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- response: 小商店/Development/Extended/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
退款需要携带证书进行请求，你这是没携带证书。
你去查查这个接口的开发文档，看看是不是有东西没配置。
400是没给httpclient填apiclient_cert.pem参数，即非受信任请求，被微信拒绝了
贴一下完整报错，不然谁猜得到你遇到了个啥