We also offer a feature to review all referred sales before you approve them and pay out the commission. You can simply do them by following the steps below to set this up:
From your Admin control Dashboard please click "Referral Program" and then "Manage".
Now select the campaign you would like to modify.
At This page you need to click on the link says Show advance settings and Check the field says "All sales from this referral program must be approved before being added"