code: public static boolean verifyNotify(Map<String, String> params, String paternerKey) {
  		String sign = params.get("sign");
  		String localSign = PaymentKit.createSign(params, paternerKey);
  		return sign.equals(localSign);
  	}
docs: 支付异步通知时校验sign
  
  @param params
  参数
  @param paternerKey
  支付密钥
  @return {boolean}