The entire principal balance outstanding hereunder, together with all accrued and unpaid interest thereon, shall be due and payable in full on the Maturity Date. All payments made hereunder shall be made when due in United States Dollars in immediately available funds. All payments made hereunder shall be applied first to accrued interest, and second to the payment of the principal amount outstanding hereunder. Any principal amounts paid under this Agreement may not be re-borrowed.