If you want to inform something to your affiliate about the payout, then you add notes to the Invoice
Step 1. On the Admin Dashboard, click on "Rewards".
Step 2. Under "Manage Invoices", click the blue "Edit" button across a specific Affiliate ,to whom you want to add the notes.
Step 3. In the next page, scroll down to see the Comments Box. First box is for internal comments for the yourself(Admin). Second box is for the Affiliate to see. After adding the Notes, click on "Update".
Step 4. Once your Affiliate login to their Dashboard, under "My Rewards" click "View Details".
Step 5. The notes that you added appears as "Comments from Administrator".