docs: public static QueryCouponStockResult mmpaymkttransfersQuery_coupon_stock(QueryCouponStock queryCouponStock,String key){
  		Map<String,String> map = MapUtil.objectToMap( queryCouponStock);
  		String sign = SignatureUtil.generateSign(map,queryCouponStock.getSign_type(),key);
  		queryCouponStock.setSign(sign);
  		String secapiPayRefundXML = XMLConverUtil.convertToXML( queryCouponStock);
  		HttpUriRequest httpUriRequest = RequestBuilder.post()
  				.setHeader(xmlHeader)
  				.setUri(baseURI()+ "/mmpaymkttransfers/query_coupon_stock")
  				.setEntity(new StringEntity(secapiPayRefundXML,Charset.forName("utf-8")))
  				.build();
  		return LocalHttpClient.executeXmlResult(httpUriRequest,QueryCouponStockResult.class,queryCouponStock.getSign_type(),key);
  	}