secapi/pay/refund接口对于“基本账户余额不足，请充值后重新发起”错误的返回，为什么有些return_code是错误码，return_msg是具体的错误，而有些return_code是success，result_code是fail，err_code是具体的错误，这两种情况都是“基本账户余额不足，请充值后重新发起”的错误嘛？
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- Upload Refund Voucher: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- Calling address: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- request: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- response: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/After-sales interface/Upload Refund Voucher
- 返回码: 小商店/开发/平台能力/商业能力/交易组件/基础交易工具（原标准版交易组件）及开放接口/服务端接口/返回码