A rule, not a rate
Commission is reversed if the customer churns inside a window. Full clawback within 90 days, half within 180, deducted from the next statement.
Keep the window honest
Long windows are unpopular and rarely change behaviour beyond the first months. Tie the window to the period where a bad-fit sale would show.
In Prowi
Create the plan, pick the measurement point and period, set the rule, assign it to roles. From there every closed deal in your CRM is priced live, the rep sees it in the app, the manager approves, and finance exports the file. When data changes, the correction follows automatically.