This site lists this specific fifth item directly: a defined refund policy — clear terms you can read before you order, not after.
This site is direct about timing specifically: terms you can read before you order, not after — worth checking the refund policy page directly before completing a purchase, rather than assuming standard terms apply.
This site separately recommends confirming the exact current guarantee window and conditions directly on the checkout page, since terms can change — worth reading both together as this site's consistent emphasis on checking refund terms before, not after, ordering.