Closing books will require users to have the Company Administrator access or higher, as currently the function is available only to users with such access rights. However, users with such access rights also have visibility to the billing subscription information, and therefore not provided to iShine clients.
QuickBooks has already received feedback on decoupling this particular function from the Company Administrator access right to put it to lower access rights and will work on possibly implementing this feature – at the moment, please contact the team directly whenever you would like to close your books.