5.1 Buyer shall pay Supplier within forty-five (45) days of receipt of an undisputed invoice or acceptance of Products/Services, whichever occurs later, according to NSN Payments. “NSN Payments” shall mean Nokia Solutions and Networks’ centralized system for payments pursuant to which all invoices maturing during a working week (i.e. Monday through Friday) are consolidated and paid on one predetermined business day during that same week irrespective of the invoice due date. At the moment, the payment day is Wednesday, but the payment day is subject to change by Buyer at any time without notice. Buyer is entitled to withhold payments if Supplier has not delivered the ordered Products in full quantities and/or if any Products do not strictly confirm to the specifications and other requirements.