Why did I get result code -30?
PayPal returned result code -30 - Invalid timeout value.
Cause
You passed a negative number or a special character as your timeout value.
Solution
Review the script or code from your website or application. Confirm that you're not passing a negative number or a special character as your timeout value, and change the value if necessary.
Note: The default value of the examples provided located in the SDK (Software Document Kit) client is 30 seconds. PayPal recommends that you use this number as your timeout value.