An "admin fee" is a charge or fee that is required to cover the administrative tasks or services provided. It is commonly used in situations where paperwork, processing, or other administrative work needs to be done. Full definition
1 night deposit as admin fee for cancellations more than 60 days out else the entire fee. (mauiownercondos.com)
If you decide to cancel your plan within this period you will receive a full refund of premium, minus a small admin fee of around $ 8. (travelinsurancereview.net)