/// <summary>
/// �˿�
/// </summary>
/// <param name="p1_MerId">�̻����</param>
/// <param name="keyValue">�̻���Կ</param>
/// <param name="pb_TrxId">yeepay��ˮ��</param>
/// <param name="p3_Amt">�˿���</param>
/// <param name="p4_Cur">����</param>
/// <param name="p5_Desc">�˿�˵��</param>
/// <returns></returns>
public static BuyRefundOrdResult RefundOrd(string pb_TrxId, string p3_Amt, string p4_Cur, string p5_Desc)
{
string sbOld = "";
sbOld += "RefundOrd";
sbOld += merchantId;
sbOld += pb_TrxId;
sbOld += p3_Amt;
sbOld += p4_Cur;
sbOld += p5_Desc;
string hmac = Digest.HmacSign(sbOld, keyValue);
logstr(pb_TrxId, sbOld, hmac);
string para = "";
para += "?p0_Cmd=RefundOrd";
para += "&p1_MerId=" + merchantId; //�����̼�ID
para += "&pb_TrxId=" + pb_TrxId;
para += "&p3_Amt=" + p3_Amt; //���빺������
para += "&p4_Cur=" + p4_Cur;
para += "&p5_Desc=" + HttpUtility.UrlEncode(p5_Desc, System.Text.Encoding.GetEncoding("gb2312"));
para += "&hmac=" + hmac; //��������
string reqResult = HttpUtils.SendRequest(queryRefundReqURL, para);
string r0_Cmd = FormatQueryString.GetQueryString("r0_Cmd", reqResult, '\n');
string r1_Code = FormatQueryString.GetQueryString("r1_Code", reqResult, '\n');
string r2_TrxId = FormatQueryString.GetQueryString("r2_TrxId", reqResult, '\n');
string r3_Amt = FormatQueryString.GetQueryString("r3_Amt", reqResult, '\n');
string r4_Cur = FormatQueryString.GetQueryString("r4_Cur", reqResult, '\n');
hmac = FormatQueryString.GetQueryString("hmac", reqResult, '\n');
//string hmac = FormatQueryString.GetQueryString("hmac", reqResult, '\n');
BuyRefundOrdResult result = new BuyRefundOrdResult(r0_Cmd, r1_Code, r2_TrxId, r3_Amt, r4_Cur, hmac);
return result;
}