Typically a company wants this position to be able to create lists of expenses - usually in Excel . So brush up on your Excel skills, if time permits, but don't worry about it.
Hallmarks of a good AP person: dependable (shows up to work and on time), accurate, follows rules well (follows rules on who has authority to approve an invoice), keeps mouth shut ( because you will see lots of confidential info and don't discuss this with other employees), and masters the accounts payable system (can run special reports.)