I'm using the API to extract all tasks that are not completed. However, the function of the API is not able to retrieve only the "not completed" tasks. The API retrieves every Task. How to add some filters into the URL?

I'm following the official documentation for using this function :  http://www.zoho.com/projects/developers/tasklists-api.html#5. However, the documentation doesn't speak about such filter for having only the "not completed" tasks.

Could you help me?

Tanks