Within thirty (30) days after the end of each calendar month, Provider shall send Recipient an invoice for the Service Fees and, in reasonable detail, the Expenses due in connection with the Services provided to Recipient during the immediately preceding calendar month. Payments of invoices shall be made by check or wire transfer of immediately available funds to one or more accounts specified in writing by Provider. Payment shall be made within thirty (30) days after the date of receipt of Provider’s invoice.