V2版文档中，退款查询接口有返回refund_count，实际中没有返回此字段

<xml>

<appid><![CDATA[wx04a784ab]]></appid>

<cash_fee><![CDATA[129]]></cash_fee>

<mch_id><![CDATA[16030412]]></mch_id>

<nonce_str><![CDATA[BsDul9lnam]]></nonce_str>

<out_refund_no><![CDATA[81a0f1890ef74dd0a065984b86696]]></out_refund_no>

<out_trade_no><![CDATA[2d4a558bfc2241d1b2c0e6b498d0e]]></out_trade_no>

<refund_account><![CDATA[REFUND_SOURCE_RECHARGE_FUNDS]]></refund_account>

<refund_channel><![CDATA[ORIGINAL]]></refund_channel>

<refund_fee>129</refund_fee>

<refund_id><![CDATA[503011074120210320073081889]]></refund_id>

<refund_recv_accout><![CDATA[支付用户的零钱]]></refund_recv_accout>

<refund_status><![CDATA[SUCCESS]]></refund_status>

<refund_success_time><![CDATA[2021-03-20 11:48:12]]></refund_success_time>

<result_code><![CDATA[SUCCESS]]></result_code>

<return_code><![CDATA[SUCCESS]]></return_code>

<return_msg><![CDATA[OK]]></return_msg>

<sign><![CDATA[862BCD0C12F0C3B18E58F5F1D2EEC]]></sign>

<total_fee><![CDATA[129]]></total_fee>

<transaction_id><![CDATA[4200000938202181942899259]]></transaction_id>

</xml>