同一笔订单多次申请退款，返回状态均显示成功，但是微信上并没有收到退款通知;

请求信息为：

<xml><appid>xxxxxxxxxxxx</appid><mch_id>xxxxxx</mch_id><nonce_str>xxxxxxxxxxxxx</nonce_str><out_refund_no>xxxxxxxx</out_refund_no><out_trade_no>xxxxxxxxxx</out_trade_no><refund_desc>xxx</refund_desc><refund_fee>1</refund_fee><refund_fee_type>CNY</refund_fee_type><sign><![CDATA[693xxxxxxxxxxxxx23]]></sign><total_fee>1</total_fee></xml>

返回信息为：

<?xml version="1.0" encoding="utf-8"?>

<xml>

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

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

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

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

 <nonce_str><![CDATA[5xxxxxxx]]></nonce_str>

 <sign><![CDATA[7E6168C5D0908CxxxxxxxxF]]></sign>

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

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

 <out_trade_no><![CDATA[1xxxxxxxxxxxxxxxxx]]></out_trade_no>

 <out_refund_no><![CDATA[1xxxxxxxxxxxxxxxxxxxxx]]></out_refund_no>

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

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

 <refund_fee>1</refund_fee>

 <coupon_refund_fee>0</coupon_refund_fee>

 <total_fee>1</total_fee>

 <cash_fee>1</cash_fee>

 <coupon_refund_count>0</coupon_refund_count>

 <cash_refund_fee>1</cash_refund_fee>

</xml>