Except as expressly set forth in this Section 14.1, all amounts due under this Section 14.1 shall be payable promptly after demand therefor. A certificate of the Agent or a Lender which sets forth the amount or amounts owing to the Agent, Lender or a sub-agent or Related Party, as the case may be, as specified in this Section 14.1, including reasonable detail of the basis of calculation of the amount or amounts, and delivered to the Borrower shall be conclusive absent manifest error.