The Service Provider will invoice each Service Recipient from time to time, as determined by the Service Provider in its sole discretion, subject to the provisions of this Section  3.2 . Service Recipients will pay undisputed invoiced amounts promptly after the receipt of each such invoice. The Service Provider shall send an invoice to each Service Recipient on or before the twentieth (20th) day following the end of each month for charges incurred in the preceding month. Such invoices will be accompanied by statements which identify in reasonable detail all charges and credits, summarized by appropriate classifications of expense. Unless otherwise provided for in this Agreement, the Service Provider may require each Service Recipients to advance estimated cash outlays for the succeeding month’s services by the first day of the month for which the advance is required. The Service Provider shall adjust each monthly billing to reflect advances received by each Service Recipients. The Service Recipients shall pay all invoices within thirty (30) days after receipt. If requested by a Service Recipient, the Service Provider shall either (x) reimburse such Service Recipient at the end of such month the amount of any surplus advanced by or on behalf of such Service Recipients hereunder, or (y) apply any such surplus to amounts due to be paid by such Service Recipient in the next succeeding month. The payment and other obligations of the Company under any provision of this Agreement are the joint and several obligations of both the Company and the Corporation.