Programmer Manual (API)
REST API Is Moved to Apiary
WorkLogPRO REST API is available on Apiary. You can browse our API and generate source code for various programming languages. It has a lot of options when compared to only textual api documentation. We strongly suggest you to give it a try.
Java API
WorklogPRO Java API is available here. You can use Java API for integration with your own apps, Script Runner scripts or "Worklog Verification" scripts.
WorklogPRO also has build-in scripting feature which allows you to verify worklogs, do custom actions when work logged, timesheet approved etc. Please check Scripting page for more details.