(1) We may also issue our invoices electronically and transmit them electronically to the customer. Our invoices are payable immediately and are due with the delivery/service unless otherwise agreed. However, even within the framework of an ongoing business relationship, we are entitled at any time to make a delivery in whole or in part only against advance payment; we must declare such a reservation at the latest with our order confirmation. Discounts shall not be granted unless expressly agreed in advance. The customer shall be in default upon expiry of the aforementioned payment period. If the receipt of the invoice is disputed, the customer shall be entitled to payment without reminder no later than thirty days after delivery of the goods. This shall not affect the possibility of causing the default elsewhere or the right to demand commercial interest on the due date.
(2) Payments shall be made in Euro. They are to be sent free of charge to the paying agents specified by us. Bills of exchange and cheques are not accepted.
(3) Payments shall always be offset first against any costs, then against interest, then against the principal debt, initially against the unenforceable debt and then against the older debt. The customer is not entitled to withhold and set off payments due to any counterclaims, including claims based on liability for defects, unless the claims are undisputed or have been legally established.
(4) In the event of circumstances which become known to us after conclusion of the contract and which give rise to reasonable doubts as to the creditworthiness of the customer, we shall be entitled to demand immediate payment of all our claims, including bills of exchange. This applies in particular in the case of creditworthiness regressions caused by economic information files (from a rating of creditworthiness as "strained") or in the case of a at least comparable deterioration of the rating in our commercial credit insurance. We may then demand advance payment; instead, the customer may demand performance step by step at the location of the goods.