When trying to access the Timetracker API, if you encounter the following error message for the SSIS OData-Source - "The payload kind 'ServerDocument' of the given data feed is not supported" - please change your settings as per the screenshots, below.
Navigate to the Configuration tab of Timetracker and then select "API".
Copy the link found under the 'Your Reporting API Root Is' label:
... and paste here ...
... and this into the OData Source: