/// <summary>
/// 下载资金账单
/// </summary>
/// <param name="AdminHotelid"></param>
/// <param name="hotelid"></param>
/// <param name="bill_date"></param>
/// <returns></returns>
public static string DownloadFundFlow(string AdminHotelid, int hotelid, string bill_date)
{
WxPayData data = new WxPayData();
data.SetValue("bill_date", bill_date); //资金账单日期
WxPayData result = WxPayApi.DownloadFundFlow(data, AdminHotelid, hotelid); //提交退款申请给API，接收返回数据
return(result.ToXml());
}