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