Any amount payable by a party hereto (the “ Paying Party ”) hereunder (including payments made under Section 5 ) will be paid to the other party within 10 business days following receipt by the Paying Party of an invoice for such amount, detailing the calculation of such amount. AHL shall have the option, at its sole discretion, to cause to be paid by AUSA on behalf of AHL any payments or reimbursements due by AHL hereunder.