code: public static String generatePapayEntrustwebURL(PapayEntrustweb papayEntrustweb, String key) {
  		Map<String, String> map = MapUtil.objectToMap(papayEntrustweb);
  		String sign = SignatureUtil.generateSign(map, key);
  		map.put("sign", sign);
  		String params = MapUtil.mapJoin(map, false, true);
  		return "https://api.mch.weixin.qq.com/papay/entrustweb?" + params;
  	}
docs: 生成委托代扣-公众号、APP 纯签约
  
  @param papayEntrustweb
  papayEntrustweb
  @param key
  key
  @return url