Payments, as set forth on each applicable Schedule, are due monthly or within 30 days from receipt of invoice (if sent via electronic transmission, Overstock receipt is deemed to be the date of such transmission).  If Overstock disputes the validity of an invoiced fee, Overstock must provide prompt written notice to SiteHelix stating the details of any such dispute.  If only a portion on an invoice is in dispute, Overstock shall pay all undisputed amounts in accordance with the terms of this section.  Acceptance by SiteHelix of any partial payment does not constitute a waiver of the disputed amounts.  If SiteHelix disputes the amount of any payment, it shall notify Overstock in writing within 30 days from receipt of such disputed payment.  Any undisputed amounts not paid within 30 days of the date of invoice shall accrue interest at a rate of one percent per month or the maximum lawful rate, whichever is less.