Sometimes you will want to recalculate existing commissions based on changes to your commission plans. There are two methods for you to do this.
To recalculate in bulk, you must first head to your traffic tab and view purchases. Then, as shown below, you can select multiple purchases via the check-boxes, and use Recalculate Commissions for Selected Purchases from the Actions dropdown.
You can also recalculate commissions for purchases directly on the full pageview. To do this, first click on the ID of the purchase whose commission you would like to recalculate.
On this page, you can edit or cancel the purchase, and (most importantly), recalculate commissions.