The statusCode in the response will be non-zero should there is an error.
|1||invalid app key|
|4||key not exists|
|5||key is unavailable|
Important: the value of the date field in the request parameters should be as close as possible to the date of the server you are talking to. If you encounter a statusCode 3, use the timestamp value from the server response to adjust the timestamp value in your request accordingly.