All costs concerning the further use or importation by Customer of any Product resulting from the Services are to be borne by Customer, including any administration fees connected with the marketing of the Product, even if the respective administrative authority should charge Rentschler directly. For any such fees invoiced to Rentschler directly, Customer shall reimburse Rentschler (or pay to Rentschler, if notified in advance of when such fee becomes due) any fees that Rentschler is required to remit on Customer’s behalf pursuant to this Section 13.1. [***] following a valid invoice for such fees, unless the Parties otherwise agree an alternative payment period in writing at the time Customer is notified of the applicable fee. Customer will inform Rentschler about any administrative requirement applicable to Rentschler of any country Customer is marketing its Product as soon as possible.