In my company, we have different types of employees with different contracts (full-time, part-time, seasonal contracts). I want to set up a leave policy in LeaveWizard so that the system automatically calculates different leave days based on the employee's contract type and seniority. In addition, we also need to synchronize this data with the existing HR system via API. Does LeaveWizard support such deep customization, and what is the best way to implement it in practice? (Geometry Dash)