请求地址：https://api.mch.weixin.qq.com/secapi/pay/refund

参数中未提供商户信息，如有需要可单独提供

微信小程序请求退款异常,请求参数:<xml>

<nonce_str>7417477239727177728</nonce_str>

<out_trade_no>0126031241102085115988085_2</out_trade_no>

<transaction_id>4200002373202411025594722434</transaction_id>

<out_refund_no>7417477239729373185</out_refund_no>

<total_fee>100</total_fee>

<refund_fee>100</refund_fee>

<op_user_id>1329402101</op_user_id>

</xml>,异常:org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request

at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:79)

at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:122)

at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102)

at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63)

at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778)

at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736)

at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670)